diff -ur ratpoison/src/input.c ratpoison-tab/src/input.c
--- ratpoison/src/input.c	Fri Jun  1 21:32:59 2001
+++ ratpoison-tab/src/input.c	Wed Aug 15 22:42:03 2001
@@ -319,10 +319,15 @@
     {
       PRINT_DEBUG ("key %ld\n", ch);
       if (ch == XK_BackSpace)
-	{
+    {
 	  if (cur_len > 0) cur_len--;
 	  update_input_window(s, prompt, str, cur_len);
 	}
+      else if (ch == XK_Tab)
+        {
+           cur_len = complete_window_name(str, cur_len, allocated_len);
+           update_input_window(s, prompt, str, cur_len);
+        }
       else
 	{
 	  if (cur_len + nbytes > allocated_len - 1)
diff -ur ratpoison/src/list.c ratpoison-tab/src/list.c
--- ratpoison/src/list.c	Wed Jun  6 20:55:28 2001
+++ ratpoison-tab/src/list.c	Wed Aug 15 23:26:15 2001
@@ -185,6 +185,59 @@
   return NULL;
 }
 
+/* Auto-completion of window a window name. Partly completed name given 
+   by 'str' with current length 'cur_len' and max length 'max_len'.
+   Added by Jess Kube <address@hidden> */
+int complete_window_name (char* str, int cur_len, int max_len)
+{
+  rp_window *w;
+  char **names;
+  int i, count;
+  char ch;
+ 
+  for (count = 0, w = rp_mapped_window_sentinel->next; 
+       w != rp_mapped_window_sentinel; 
+       w = w->next, count++);
+
+  /* alloc an array for worst number of possible matches */
+  names = malloc (count * sizeof(char*));
+
+  for (count = 0, w = rp_mapped_window_sentinel->next; 
+       w != rp_mapped_window_sentinel; 
+       w = w->next)
+    {
+      if (w->name != NULL && str_comp (str, w->name, cur_len)) 
+        {
+          PRINT_DEBUG("Adding candidate window: %s")
+          names[count++] = w->name;
+        }
+    }
+
+  max_len--;
+  while (cur_len < max_len && count > 0)
+    {
+      ch = names[0][cur_len];
+      for (i = 1; i < count; i++)
+        {
+          if (toupper (ch) != toupper (names[i][cur_len]))
+            {
+              /* There is a discrepancy in match.. don't commit to this ch */
+              count = 0;
+              break;
+            }
+        }
+      if (ch == '\0') 
+        count = 0;
+
+      /* if count is still > 0, we can commit to this char */
+      if (count > 0) 
+        str[cur_len++] = ch;
+    }
+
+  free (names);
+  return cur_len;
+}
+
 /* Return the previous window in the list. Assumes window is in the
    mapped window list. */
 rp_window*
diff -ur ratpoison/src/list.h ratpoison-tab/src/list.h
--- ratpoison/src/list.h	Fri Jun  1 13:33:51 2001
+++ ratpoison-tab/src/list.h	Wed Aug 15 22:41:57 2001
@@ -46,6 +46,7 @@
 rp_window *find_window_next (rp_window *w);
 rp_window *find_window_next_with_frame (rp_window *w);
 rp_window *find_window_number (int n);
+int complete_window_name (char* str, int cur_len, int max_len);
 void sort_window_list_by_number ();
 
 void append_to_list (rp_window *win, rp_window *sentinel);
@@ -53,5 +54,7 @@
 void remove_from_list (rp_window *win);
 
 void print_window_information (rp_window *win);
+
+
 
 #endif /* ! _RATPOISON_LIST_H */