quote(t.thing_char)), c_id)
                 if hasattr(t, 'carrying') and t.carrying:
                     self.io.send('THING_CARRYING %s' % (t.id_), c_id)
+                if hasattr(t, 'installable') and not t.portable:
+                    self.io.send('THING_INSTALLED %s' % (t.id_), c_id)
             for big_yx in self.portals:
                 for little_yx in [little_yx for little_yx in self.portals[big_yx]
                                   if player.fov_test(big_yx, little_yx)]:
 
             if (t) {
                 t.carrying = true;
             };
+        } else if (tokens[0] === 'THING_INSTALLED') {
+            let t = game.get_thing(tokens[1], false);
+            if (t) {
+                t.installed = true;
+            };
         } else if (tokens[0] === 'TERRAIN') {
             game.terrains[tokens[1]] = tokens[2]
         } else if (tokens[0] === 'MAP') {
     get_thing_info: function(t) {
         const symbol = game.thing_types[t.type_];
         let info = t.type_ + " / " + symbol;
-         if (t.thing_char) {
-             info += t.thing_char;
-         };
-         if (t.name_) {
-             info += " (" + t.name_ + ")";
-         }
+        if (t.thing_char) {
+            info += t.thing_char;
+        };
+        if (t.name_) {
+            info += " (" + t.name_ + ")";
+        }
+        if (t.installed) {
+            info += " / installed";
+        }
         return info;
     },
     annotate: function(msg) {
 
     game.thing_types[thing_type] = symbol_hint
 cmd_THING_TYPE.argtypes = 'string char'
 
+def cmd_THING_INSTALLED(game, thing_id):
+    game.get_thing(thing_id).installed = True
+cmd_THING_INSTALLED.argtypes = 'int:pos'
+
 def cmd_THING_CARRYING(game, thing_id):
     game.get_thing(thing_id).carrying = True
-cmd_THING_CARRYING.argtypes = 'int:nonneg'
+cmd_THING_CARRYING.argtypes = 'int:pos'
 
 def cmd_TERRAIN(game, terrain_char, terrain_desc):
     game.terrains[terrain_char] = terrain_desc
         self.register_command(cmd_THING_NAME)
         self.register_command(cmd_THING_CHAR)
         self.register_command(cmd_THING_CARRYING)
+        self.register_command(cmd_THING_INSTALLED)
         self.register_command(cmd_TERRAIN)
         self.register_command(cmd_MAP)
         self.register_command(cmd_MAP_CONTROL)
             info += t.thing_char
         if hasattr(t, 'name'):
             info += ' (%s)' % t.name
+        if hasattr(t, 'installed'):
+            info += ' / installed'
         return info
 
     def loop(self, stdscr):