diff --git a/src/mged/attach.c b/src/mged/attach.c
index d242be124d..7e71edcbfb 100644
--- a/src/mged/attach.c
+++ b/src/mged/attach.c
@@ -108,8 +108,8 @@ mged_dm_init(
 
 #ifdef HAVE_TK
     if (dm_graphical(DMP) && !BU_STR_EQUAL(dm_get_dm_name(DMP), "swrast")) {
-	Tk_DeleteGenericHandler(doEvent, (ClientData)NULL);
-	Tk_CreateGenericHandler(doEvent, (ClientData)NULL);
+	Tk_DeleteGenericHandler(doEvent, (ClientData)s);
+	Tk_CreateGenericHandler(doEvent, (ClientData)s);
     }
 #endif
     (void)dm_configure_win(DMP, 0);
@@ -200,7 +200,7 @@ release(struct mged_state *s, char *name, int need_close)
 	if (mged_variables->mv_listen) {
 	    /* drop all clients */
 	    mged_variables->mv_listen = 0;
-	    fbserv_set_port(s, NULL, NULL, NULL, NULL, NULL);
+	    fbserv_set_port(NULL, NULL, NULL, NULL, s);
 	}
 
 	/* release framebuffer resources */
@@ -328,7 +328,7 @@ f_attach(ClientData clientData, Tcl_Interp *interpreter, int argc, const char *a
 
 
 int
-gui_setup(const char *dstr)
+gui_setup(struct mged_state *s, const char *dstr)
 {
 #ifdef HAVE_TK
     Tk_GenericProc *handler = doEvent;
@@ -393,7 +393,7 @@ gui_setup(const char *dstr)
     }
 
     /* create the event handler */
-    Tk_CreateGenericHandler(handler, (ClientData)NULL);
+    Tk_CreateGenericHandler(handler, (ClientData)s);
 
     Tcl_Eval(INTERP, "wm withdraw .");
     Tcl_Eval(INTERP, "tk appname mged");
@@ -436,14 +436,14 @@ mged_attach(struct mged_state *s, const char *wp_name, int argc, const char *arg
 
 	struct bu_vls *dname = dm_get_dname(tmp_dmp);
 	if (dname && bu_vls_strlen(dname)) {
-	    if (gui_setup(bu_vls_cstr(dname)) == TCL_ERROR) {
+	    if (gui_setup(s, bu_vls_cstr(dname)) == TCL_ERROR) {
 		bu_free((void *)mged_curr_dm, "f_attach: dm_list");
 		set_curr_dm(s, o_dm);
 		bu_vls_free(&tmp_vls);
 		dm_close(tmp_dmp);
 		return TCL_ERROR;
 	    }
-	} else if (gui_setup((char *)NULL) == TCL_ERROR) {
+	} else if (gui_setup(s, (char *)NULL) == TCL_ERROR) {
 	    bu_free((void *)mged_curr_dm, "f_attach: dm_list");
 	    set_curr_dm(s, o_dm);
 	    bu_vls_free(&tmp_vls);
diff --git a/src/mged/buttons.c b/src/mged/buttons.c
index 74e61157e2..12c7ce98e5 100644
--- a/src/mged/buttons.c
+++ b/src/mged/buttons.c
@@ -361,8 +361,12 @@ bv_zoomout(ClientData UNUSED(clientData), Tcl_Interp *UNUSED(interp), int UNUSED
 
 
 int
-bv_rate_toggle(ClientData UNUSED(clientData), Tcl_Interp *UNUSED(interp), int UNUSED(argc), char *UNUSED(argv[]))
+bv_rate_toggle(ClientData clientData, Tcl_Interp *UNUSED(interp), int UNUSED(argc), char *UNUSED(argv[]))
 {
+    struct cmdtab *ctp = (struct cmdtab *)clientData;
+    MGED_CK_CMD(ctp);
+    struct mged_state *s = ctp->s;
+
     mged_variables->mv_rateknobs = !mged_variables->mv_rateknobs;
 
     {
@@ -371,7 +375,7 @@ bv_rate_toggle(ClientData UNUSED(clientData), Tcl_Interp *UNUSED(interp), int UN
 	const char name[] = "name";
 	void *base = 0;
 	const char value[] = "value";
-	set_scroll_private(sdp, name, base, value, NULL);
+	set_scroll_private(sdp, name, base, value, s);
     }
 
     return TCL_OK;
diff --git a/src/mged/cmd.c b/src/mged/cmd.c
index 3420723f1e..e1a7f2d016 100644
--- a/src/mged/cmd.c
+++ b/src/mged/cmd.c
@@ -856,8 +856,12 @@ cmd_ged_dm_wrapper(ClientData clientData, Tcl_Interp *interpreter, int argc, con
  * Usage:  loadtk [displayname[.screennum]]
  */
 int
-cmd_tk(ClientData UNUSED(clientData), Tcl_Interp *interpreter, int argc, const char *argv[])
+cmd_tk(ClientData clientData, Tcl_Interp *interpreter, int argc, const char *argv[])
 {
+    struct cmdtab *ctp = (struct cmdtab *)clientData;
+    MGED_CK_CMD(ctp);
+    struct mged_state *s = ctp->s;
+
     int status;
 
     if (argc < 1 || 2 < argc) {
@@ -870,9 +874,9 @@ cmd_tk(ClientData UNUSED(clientData), Tcl_Interp *interpreter, int argc, const c
     }
 
     if (argc == 1)
-	status = gui_setup((char *)NULL);
+	status = gui_setup(s, (char *)NULL);
     else
-	status = gui_setup(argv[1]);
+	status = gui_setup(s, argv[1]);
 
     return status;
 }
diff --git a/src/mged/color_scheme.c b/src/mged/color_scheme.c
index 6a90dc2f65..771c866215 100644
--- a/src/mged/color_scheme.c
+++ b/src/mged/color_scheme.c
@@ -260,8 +260,6 @@ cs_update(const struct bu_structparse *sdp,
 	  const char *value,
 	  void *data)
 {
-    struct cmdtab *ctp = (struct cmdtab *)data;
-    MGED_CK_CMD(ctp);
     struct bu_structparse *sp;
     struct bu_vls vls = BU_VLS_INIT_ZERO;
     int offset;
diff --git a/src/mged/doevent.c b/src/mged/doevent.c
index a52cb90b3d..f7e8ba93a0 100644
--- a/src/mged/doevent.c
+++ b/src/mged/doevent.c
@@ -115,9 +115,7 @@ static int button0 = 0;
 int
 doEvent(ClientData clientData, XEvent *eventPtr)
 {
-    struct cmdtab *ctp = (struct cmdtab *)clientData;
-    MGED_CK_CMD(ctp);
-    struct mged_state *s = ctp->s;
+    struct mged_state *s = (struct mged_state *)clientData;
     struct mged_dm *save_dm_list;
     int status;
 
diff --git a/src/mged/fbserv.c b/src/mged/fbserv.c
index 131b3cb6be..fe4b8ba36c 100644
--- a/src/mged/fbserv.c
+++ b/src/mged/fbserv.c
@@ -253,7 +253,7 @@ fbserv_new_client_handler(ClientData clientData,
 
 
 void
-fbserv_set_port(const struct bu_structparse *UNUSED(sp), const char *UNUSED(c1), void *UNUSED(v1), const char *UNUSED(c2), void *UNUSED(v2))
+fbserv_set_port(const struct bu_structparse *UNUSED(sp), const char *UNUSED(c1), void *UNUSED(v1), const char *UNUSED(c2), void *v2)
 {
     int i;
     int save_port;
@@ -440,7 +440,7 @@ fbserv_new_client_handler(ClientData clientData, int UNUSED(mask))
 
 
 void
-fbserv_set_port(struct mged_state *s, const struct bu_structparse *UNUSED(sp), const char *UNUSED(c1), void *UNUSED(v1), const char *UNUSED(c2), void *UNUSED(v2))
+fbserv_set_port(const struct bu_structparse *UNUSED(sp), const char *UNUSED(c1), void *UNUSED(v1), const char *UNUSED(c2), void *v2)
 {
     int i;
     int save_port;
@@ -499,7 +499,7 @@ fbserv_set_port(struct mged_state *s, const struct bu_structparse *UNUSED(sp), c
 	struct c_data *ncdata;
 	BU_GET(ncdata, struct c_data);
 	ncdata->fd = netfd;
-	ncdata->s = s;
+	ncdata->s = (struct mged_state *)v2;
 	Tcl_CreateFileHandler(netfd, TCL_READABLE,
 			      fbserv_new_client_handler, (ClientData)ncdata);
     }
diff --git a/src/mged/grid.c b/src/mged/grid.c
index 52be577336..3b817b56fc 100644
--- a/src/mged/grid.c
+++ b/src/mged/grid.c
@@ -449,8 +449,12 @@ update_grids(fastf_t sf)
 
 
 int
-f_grid_set (ClientData UNUSED(clientData), Tcl_Interp *interpreter, int argc, const char *argv[])
+f_grid_set (ClientData clientData, Tcl_Interp *interpreter, int argc, const char *argv[])
 {
+    struct cmdtab *ctp = (struct cmdtab *)clientData;
+    MGED_CK_CMD(ctp);
+    struct mged_state *s = ctp->s;
+
     struct bu_vls vls = BU_VLS_INIT_ZERO;
 
     if (argc < 1 || 5 < argc) {
@@ -461,7 +465,7 @@ f_grid_set (ClientData UNUSED(clientData), Tcl_Interp *interpreter, int argc, co
 	return TCL_ERROR;
     }
 
-    mged_vls_struct_parse(&vls, "Grid", grid_vparse,
+    mged_vls_struct_parse(s, &vls, "Grid", grid_vparse,
 			  (char *)grid_state, argc, argv);
     Tcl_AppendResult(interpreter, bu_vls_addr(&vls), (char *)NULL);
     bu_vls_free(&vls);
diff --git a/src/mged/mged.h b/src/mged/mged.h
index 040f500bc1..292424ddc0 100644
--- a/src/mged/mged.h
+++ b/src/mged/mged.h
@@ -466,7 +466,7 @@ int is_dm_null(void);
 int mged_attach(struct mged_state *s, const char *wp_name, int argc, const char *argv[]);
 void mged_link_vars(struct mged_dm *p);
 void mged_slider_free_vls(struct mged_dm *p);
-int gui_setup(const char *dstr);
+int gui_setup(struct mged_state *s, const char *dstr);
 
 
 /* buttons.c */
@@ -664,7 +664,7 @@ int epain(struct rt_db_internal *ip, fastf_t thick[2]);
 int etoin(struct rt_db_internal *ip, fastf_t thick[1]);
 
 /* set.c */
-extern void fbserv_set_port(struct mged_state *s, const struct bu_structparse *, const char *, void *, const char *, void *);
+extern void fbserv_set_port(const struct bu_structparse *, const char *, void *, const char *, void *);
 extern void set_scroll_private(const struct bu_structparse *, const char *, void *, const char *, void *);
 extern void mged_variable_setup(Tcl_Interp *interpreter);
 
@@ -687,8 +687,8 @@ struct wdb_pipe_pnt *pipe_del_pnt(struct wdb_pipe_pnt *);
 void pipe_move_pnt(struct rt_pipe_internal *, struct wdb_pipe_pnt *, const point_t);
 
 /* vparse.c */
-extern void mged_vls_struct_parse(struct bu_vls *vls, const char *title, struct bu_structparse *how_to_parse, const char *structp, int argc, const char *argv[]); /* defined in vparse.c */
-extern void mged_vls_struct_parse_old(struct bu_vls *vls, const char *title, struct bu_structparse *how_to_parse, char *structp, int argc, const char *argv[]);
+extern void mged_vls_struct_parse(struct mged_state *s, struct bu_vls *vls, const char *title, struct bu_structparse *how_to_parse, const char *structp, int argc, const char *argv[]); /* defined in vparse.c */
+extern void mged_vls_struct_parse_old(struct mged_state *s, struct bu_vls *vls, const char *title, struct bu_structparse *how_to_parse, char *structp, int argc, const char *argv[]);
 
 /* rtif.c */
 int build_tops(char **start, char **end);
diff --git a/src/mged/scroll.c b/src/mged/scroll.c
index e0f9e8ad0c..83c234cc81 100644
--- a/src/mged/scroll.c
+++ b/src/mged/scroll.c
@@ -131,7 +131,7 @@ sl_halt_scroll(int UNUSED(a), int UNUSED(b), int UNUSED(c))
 
 
 void
-sl_toggle_scroll(int UNUSED(a), int UNUSED(b), int UNUSED(c))
+sl_toggle_scroll(struct mged_state *s, int UNUSED(a), int UNUSED(b), int UNUSED(c))
 {
     mged_variables->mv_sliders = mged_variables->mv_sliders ? 0 : 1;
 
@@ -141,7 +141,7 @@ sl_toggle_scroll(int UNUSED(a), int UNUSED(b), int UNUSED(c))
 	const char name[] = "name";
 	void *base = 0;
 	const char value[] = "value";
-	set_scroll_private(sdp, name, base, value, NULL);
+	set_scroll_private(sdp, name, base, value, s);
     }
 }
 
diff --git a/src/mged/set.c b/src/mged/set.c
index ec6331a666..af17912cb1 100644
--- a/src/mged/set.c
+++ b/src/mged/set.c
@@ -281,8 +281,12 @@ mged_variable_setup(Tcl_Interp *interp)
 
 
 int
-f_set(ClientData UNUSED(clientData), Tcl_Interp *interp, int argc, const char *argv[])
+f_set(ClientData clientData, Tcl_Interp *interp, int argc, const char *argv[])
 {
+    struct cmdtab *ctp = (struct cmdtab *)clientData;
+    MGED_CK_CMD(ctp);
+    struct mged_state *s = ctp->s;
+
     struct bu_vls vls = BU_VLS_INIT_ZERO;
 
     if (argc < 1 || 2 < argc) {
@@ -293,7 +297,7 @@ f_set(ClientData UNUSED(clientData), Tcl_Interp *interp, int argc, const char *a
 	return TCL_ERROR;
     }
 
-    mged_vls_struct_parse_old(&vls, "mged variables", mged_vparse,
+    mged_vls_struct_parse_old(s, &vls, "mged variables", mged_vparse,
 			      (char *)mged_variables, argc, argv);
     Tcl_AppendResult(interp, bu_vls_addr(&vls), (char *)NULL);
     bu_vls_free(&vls);
@@ -307,8 +311,9 @@ set_scroll_private(const struct bu_structparse *UNUSED(sdp),
 		   const char *UNUSED(name),
 		   void *UNUSED(base),
 		   const char *UNUSED(value),
-		   void *UNUSED(data))
+		   void *data)
 {
+    struct mged_state *s = (struct mged_state *)data;
     struct mged_dm *save_m_dmp;
 
     save_m_dmp = mged_curr_dm;
@@ -316,7 +321,7 @@ set_scroll_private(const struct bu_structparse *UNUSED(sdp),
     for (size_t di = 0; di < BU_PTBL_LEN(&active_dm_set); di++) {
 	struct mged_dm *m_dmp = (struct mged_dm *)BU_PTBL_GET(&active_dm_set, di);
 	if (m_dmp->dm_mged_variables == save_m_dmp->dm_mged_variables) {
-	    set_curr_dm(m_dmp);
+	    set_curr_dm(s, m_dmp);
 
 	    if (mged_variables->mv_faceplate && mged_variables->mv_orig_gui) {
 		if (mged_variables->mv_sliders)	/* zero slider variables */
@@ -329,7 +334,7 @@ set_scroll_private(const struct bu_structparse *UNUSED(sdp),
 	}
     }
 
-    set_curr_dm(save_m_dmp);
+    set_curr_dm(s, save_m_dmp);
 }
 
 
@@ -374,8 +379,9 @@ set_dlist(const struct bu_structparse *UNUSED(sdp),
 	  const char *UNUSED(name),
 	  void *UNUSED(base),
 	  const char *UNUSED(value),
-	  void *UNUSED(data))
+	  void *data)
 {
+    struct mged_state *s = (struct mged_state *)data;
     struct mged_dm *save_dlp;
 
     /* save current display manager */
@@ -395,8 +401,8 @@ set_dlist(const struct bu_structparse *UNUSED(sdp),
 
 	    if (dm_get_displaylist(dlp1->dm_dmp) &&
 		dlp1->dm_dlist_state->dl_active == 0) {
-		set_curr_dm(dlp1);
-		createDLists(GEDP->ged_gdp->gd_headDisplay);
+		set_curr_dm(s, dlp1);
+		createDLists(s->GEDP->ged_gdp->gd_headDisplay);
 		dlp1->dm_dlist_state->dl_active = 1;
 		dlp1->dm_dirty = 1;
 		dm_set_dirty(dlp1->dm_dmp, 1);
@@ -439,8 +445,8 @@ set_dlist(const struct bu_structparse *UNUSED(sdp),
 
 		    dlp1->dm_dlist_state->dl_active = 0;
 
-		    gdlp = BU_LIST_NEXT(display_list, GEDP->ged_gdp->gd_headDisplay);
-		    while (BU_LIST_NOT_HEAD(gdlp, GEDP->ged_gdp->gd_headDisplay)) {
+		    gdlp = BU_LIST_NEXT(display_list, s->GEDP->ged_gdp->gd_headDisplay);
+		    while (BU_LIST_NOT_HEAD(gdlp, s->GEDP->ged_gdp->gd_headDisplay)) {
 			next_gdlp = BU_LIST_PNEXT(display_list, gdlp);
 
 			(void)dm_make_current(dlp1->dm_dmp);
@@ -457,7 +463,7 @@ set_dlist(const struct bu_structparse *UNUSED(sdp),
     }
 
     /* restore current display manager */
-    set_curr_dm(save_dlp);
+    set_curr_dm(s, save_dlp);
 }
 
 
diff --git a/src/mged/setup.c b/src/mged/setup.c
index fe82f0a15e..4a2632550d 100644
--- a/src/mged/setup.c
+++ b/src/mged/setup.c
@@ -533,7 +533,7 @@ mged_setup(Tcl_Interp **interpreter)
 
     history_setup();
     mged_global_variable_setup(*interpreter);
-    mged_variable_setup(s, *interpreter);
+    mged_variable_setup(*interpreter);
     s->GEDP->cmd_interp = (void *)*interpreter;
 
     /* Tcl needs to write nulls onto subscripted variable names */
diff --git a/src/mged/share.c b/src/mged/share.c
index ebf1826594..55a4878d4f 100644
--- a/src/mged/share.c
+++ b/src/mged/share.c
@@ -283,25 +283,29 @@ f_share(ClientData clientData, Tcl_Interp *interpreter, int argc, const char *ar
  *	rset c bg 0 0 50	--->	sets the background color to dark blue
  */
 int
-f_rset (ClientData UNUSED(clientData), Tcl_Interp *interpreter, int argc, const char *argv[])
+f_rset (ClientData clientData, Tcl_Interp *interpreter, int argc, const char *argv[])
 {
+    struct cmdtab *ctp = (struct cmdtab *)clientData;
+    MGED_CK_CMD(ctp);
+    struct mged_state *s = ctp->s;
+
     struct bu_vls vls = BU_VLS_INIT_ZERO;
 
     /* print values for all resources */
     if (argc == 1) {
-	mged_vls_struct_parse(&vls, "Axes, res_type - ax", axes_vparse,
+	mged_vls_struct_parse(s, &vls, "Axes, res_type - ax", axes_vparse,
 			      (const char *)axes_state, argc, argv);
 	bu_vls_printf(&vls, "\n");
-	mged_vls_struct_parse(&vls, "Color Schemes, res_type - c", color_scheme_vparse,
+	mged_vls_struct_parse(s, &vls, "Color Schemes, res_type - c", color_scheme_vparse,
 			      (const char *)color_scheme, argc, argv);
 	bu_vls_printf(&vls, "\n");
-	mged_vls_struct_parse(&vls, "Grid, res_type - g", grid_vparse,
+	mged_vls_struct_parse(s, &vls, "Grid, res_type - g", grid_vparse,
 			      (const char *)grid_state, argc, argv);
 	bu_vls_printf(&vls, "\n");
-	mged_vls_struct_parse(&vls, "Rubber Band, res_type - r", rubber_band_vparse,
+	mged_vls_struct_parse(s, &vls, "Rubber Band, res_type - r", rubber_band_vparse,
 			      (const char *)rubber_band, argc, argv);
 	bu_vls_printf(&vls, "\n");
-	mged_vls_struct_parse(&vls, "MGED Variables, res_type - var", mged_vparse,
+	mged_vls_struct_parse(s, &vls, "MGED Variables, res_type - var", mged_vparse,
 			      (const char *)mged_variables, argc, argv);
 
 	Tcl_AppendResult(interpreter, bu_vls_addr(&vls), (char *)NULL);
@@ -316,7 +320,7 @@ f_rset (ClientData UNUSED(clientData), Tcl_Interp *interpreter, int argc, const
 	    if (argv[1][1] == 'd' || argv[1][1] == 'D')
 		bu_vls_printf(&vls, "rset: use the adc command for the 'adc' resource");
 	    else if (argv[1][1] == 'x' || argv[1][1] == 'X')
-		mged_vls_struct_parse(&vls, "Axes", axes_vparse,
+		mged_vls_struct_parse(s, &vls, "Axes", axes_vparse,
 				      (const char *)axes_state, argc-1, argv+1);
 	    else {
 		bu_vls_printf(&vls, "rset: resource type '%s' unknown\n", argv[1]);
@@ -328,24 +332,24 @@ f_rset (ClientData UNUSED(clientData), Tcl_Interp *interpreter, int argc, const
 	    break;
 	case 'c':
 	case 'C':
-	    mged_vls_struct_parse(&vls, "Color Schemes", color_scheme_vparse,
+	    mged_vls_struct_parse(s, &vls, "Color Schemes", color_scheme_vparse,
 				  (const char *)color_scheme, argc-1, argv+1);
 	    break;
 	case 'g':
 	case 'G':
-	    mged_vls_struct_parse(&vls, "Grid", grid_vparse,
+	    mged_vls_struct_parse(s, &vls, "Grid", grid_vparse,
 				  (const char *)grid_state, argc-1, argv+1);
 	    break;
 	case 'r':
 	case 'R':
-	    mged_vls_struct_parse(&vls, "Rubber Band", rubber_band_vparse,
+	    mged_vls_struct_parse(s, &vls, "Rubber Band", rubber_band_vparse,
 				  (const char *)rubber_band, argc-1, argv+1);
 	    break;
 	case 'v':
 	case 'V':
 	    if ((argv[1][1] == 'a' || argv[1][1] == 'A') &&
 		(argv[1][2] == 'r' || argv[1][2] == 'R'))
-		mged_vls_struct_parse(&vls, "mged variables", mged_vparse,
+		mged_vls_struct_parse(s, &vls, "mged variables", mged_vparse,
 				      (const char *)mged_variables, argc-1, argv+1);
 	    else if (argv[1][1] == 'i' || argv[1][1] == 'I')
 		bu_vls_printf(&vls, "rset: no support available for the 'view' resource");
diff --git a/src/mged/vparse.c b/src/mged/vparse.c
index 201d13d922..54f6391ead 100644
--- a/src/mged/vparse.c
+++ b/src/mged/vparse.c
@@ -32,12 +32,14 @@
 
 
 void
-mged_vls_struct_parse(struct bu_vls *vls,
-		      const char *title,
-		      struct bu_structparse *how_to_parse,
-		      const char *structp,
-		      int argc,
-		      const char *argv[])
+mged_vls_struct_parse(
+	struct mged_state *s,
+	struct bu_vls *vls,
+	const char *title,
+	struct bu_structparse *how_to_parse,
+	const char *structp,
+	int argc,
+	const char *argv[])
 {
     if (argc < 2) {
 	/* Bare set command, print out current settings */
@@ -50,7 +52,7 @@ mged_vls_struct_parse(struct bu_vls *vls,
 	bu_vls_printf(&tmp_vls, "%s=\"", argv[1]);
 	bu_vls_from_argv(&tmp_vls, argc-2, (const char **)argv+2);
 	bu_vls_putc(&tmp_vls, '\"');
-	if (bu_struct_parse(&tmp_vls, how_to_parse, structp, NULL) < 0) bu_log("Warning - bu_struct_parse failure, mged_vls_struct_parse.\n");
+	if (bu_struct_parse(&tmp_vls, how_to_parse, structp, s) < 0) bu_log("Warning - bu_struct_parse failure, mged_vls_struct_parse.\n");
 	bu_vls_free(&tmp_vls);
     }
 }
@@ -58,6 +60,7 @@ mged_vls_struct_parse(struct bu_vls *vls,
 
 void
 mged_vls_struct_parse_old(
+    struct mged_state *s,
     struct bu_vls *vls,
     const char *title,
     struct bu_structparse *how_to_parse,
@@ -72,7 +75,7 @@ mged_vls_struct_parse_old(
 	struct bu_vls tmp_vls = BU_VLS_INIT_ZERO;
 
 	bu_vls_strcpy(&tmp_vls, argv[1]);
-	if (bu_struct_parse(&tmp_vls, how_to_parse, structp, NULL) < 0) bu_log("Warning - bu_struct_parse failure, mged_vls_struct_parse_old.\n");
+	if (bu_struct_parse(&tmp_vls, how_to_parse, structp, s) < 0) bu_log("Warning - bu_struct_parse failure, mged_vls_struct_parse_old.\n");
 	bu_vls_free(&tmp_vls);
     }
 }