diff -up dwm-4.9/config.def.h dwm-4.9-nokill/config.def.h
--- dwm-4.9/config.def.h	2008-04-03 22:57:01.000000000 +0200
+++ dwm-4.9-nokill/config.def.h	2008-04-11 06:14:07.000000000 +0200
@@ -14,8 +14,9 @@
 const char tags[][MAXTAGLEN] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
 
 Rule rules[] = {
-	/* class	instance	title		tags ref	isfloating */
-	{ "Gimp",	NULL,		NULL,		NULL,		True },
+	/* class	instance	title		tags ref	isfloating iskillable*/
+	{ "Gimp",	NULL,		NULL,		NULL,		True , True},
+	{ "UXTerm",	NULL,		NULL,		NULL,		False, False },
 };
 
 /* geometries, s{x,y,w,h} and bh are already initualized here */
Nur in dwm-4.9-nokill: .config.h.swp.
diff -up dwm-4.9/dwm.c dwm-4.9-nokill/dwm.c
--- dwm-4.9/dwm.c	2008-04-03 22:57:01.000000000 +0200
+++ dwm-4.9-nokill/dwm.c	2008-04-11 05:37:02.000000000 +0200
@@ -117,6 +117,7 @@ typedef struct {
 	const char *title;
 	const char *tag;
 	Bool isfloating;
+	Bool iskillable;
 } Rule;
 
 /* function declarations */
@@ -161,6 +162,7 @@ Bool isurgent(unsigned int t);
 Bool isvisible(Client *c);
 void keypress(XEvent *e);
 void killclient(const char *arg);
+Bool killable(Client *c);
 void manage(Window w, XWindowAttributes *wa);
 void mappingnotify(XEvent *e);
 void maprequest(XEvent *e);
@@ -963,11 +965,34 @@ keypress(XEvent *e) {
 		}
 }
 
+Bool
+killable(Client *c) {
+	unsigned int i;
+	Rule *r;
+	XClassHint ch = { 0 };
+	Bool matched = True;
+
+	/* rule matching */
+	XGetClassHint(dpy, c->win, &ch);
+	for(i = 0; i < LENGTH(rules); i++) {
+		r = &rules[i];
+		if(!r->iskillable && ((r->title && strstr(c->name, r->title))
+		|| (ch.res_class && r->class && strstr(ch.res_class, r->class))
+		|| (ch.res_name && r->instance && strstr(ch.res_name, r->instance))))
+			matched=False;
+	}
+	if(ch.res_class)
+		XFree(ch.res_class);
+	if(ch.res_name)
+		XFree(ch.res_name);
+	return matched;
+}
+
 void
 killclient(const char *arg) {
 	XEvent ev;
 
-	if(!sel)
+	if(!sel || !killable(sel))
 		return;
 	if(isprotodel(sel)) {
 		ev.type = ClientMessage;