Index: uspace/srv/hid/display/dsops.c
===================================================================
--- uspace/srv/hid/display/dsops.c	(revision 338d09353f53dcb5fd2a315562bcd0b2588792d0)
+++ uspace/srv/hid/display/dsops.c	(revision 1e4a937d249f5477ae9be53bbb34c94e8942f19d)
@@ -46,4 +46,5 @@
 static errno_t disp_window_create(void *, display_wnd_params_t *, sysarg_t *);
 static errno_t disp_window_destroy(void *, sysarg_t);
+static errno_t disp_window_move_req(void *, sysarg_t, gfx_coord2_t *);
 static errno_t disp_window_resize(void *, sysarg_t, gfx_coord2_t *,
     gfx_rect_t *);
@@ -53,4 +54,5 @@
 	.window_create = disp_window_create,
 	.window_destroy = disp_window_destroy,
+	.window_move_req = disp_window_move_req,
 	.window_resize = disp_window_resize,
 	.get_event = disp_get_event
@@ -102,4 +104,19 @@
 }
 
+static errno_t disp_window_move_req(void *arg, sysarg_t wnd_id,
+    gfx_coord2_t *pos)
+{
+	ds_client_t *client = (ds_client_t *) arg;
+	ds_window_t *wnd;
+
+	wnd = ds_client_find_window(client, wnd_id);
+	if (wnd == NULL)
+		return ENOENT;
+
+	log_msg(LVL_NOTE, LVL_DEBUG, "disp_window_move_req()");
+	ds_window_move_req(wnd, pos);
+	return EOK;
+}
+
 static errno_t disp_window_resize(void *arg, sysarg_t wnd_id,
     gfx_coord2_t *offs, gfx_rect_t *nbound)
Index: uspace/srv/hid/display/test/window.c
===================================================================
--- uspace/srv/hid/display/test/window.c	(revision 338d09353f53dcb5fd2a315562bcd0b2588792d0)
+++ uspace/srv/hid/display/test/window.c	(revision 1e4a937d249f5477ae9be53bbb34c94e8942f19d)
@@ -201,5 +201,9 @@
 	PCUT_ASSERT_INT_EQUALS(dsw_idle, wnd->state);
 
+	wnd->dpos.x = 10;
+	wnd->dpos.y = 10;
+
 	event.type = POS_PRESS;
+	event.btn_num = 2;
 	event.hpos = 10;
 	event.vpos = 10;
@@ -216,6 +220,6 @@
 
 	PCUT_ASSERT_INT_EQUALS(dsw_moving, wnd->state);
-	PCUT_ASSERT_INT_EQUALS(wnd->dpos.x, 1);
-	PCUT_ASSERT_INT_EQUALS(wnd->dpos.y, 2);
+	PCUT_ASSERT_INT_EQUALS(11, wnd->dpos.x);
+	PCUT_ASSERT_INT_EQUALS(12, wnd->dpos.y);
 
 	event.type = POS_RELEASE;
@@ -227,6 +231,48 @@
 
 	PCUT_ASSERT_INT_EQUALS(dsw_idle, wnd->state);
-	PCUT_ASSERT_INT_EQUALS(wnd->dpos.x, 3);
-	PCUT_ASSERT_INT_EQUALS(wnd->dpos.y, 4);
+	PCUT_ASSERT_INT_EQUALS(13, wnd->dpos.x);
+	PCUT_ASSERT_INT_EQUALS(14, wnd->dpos.y);
+
+	ds_window_destroy(wnd);
+	ds_client_destroy(client);
+	ds_display_destroy(disp);
+}
+
+/** Test ds_window_move_req() */
+PCUT_TEST(window_move_req)
+{
+	gfx_context_t *gc;
+	ds_display_t *disp;
+	ds_client_t *client;
+	ds_window_t *wnd;
+	display_wnd_params_t params;
+	gfx_coord2_t pos;
+	errno_t rc;
+
+	rc = gfx_context_new(&dummy_ops, NULL, &gc);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ds_display_create(gc, &disp);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	rc = ds_client_create(disp, NULL, NULL, &client);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	display_wnd_params_init(&params);
+	params.rect.p0.x = params.rect.p0.y = 0;
+	params.rect.p1.x = params.rect.p1.y = 1;
+
+	rc = ds_window_create(client, &params, &wnd);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+
+	PCUT_ASSERT_INT_EQUALS(dsw_idle, wnd->state);
+
+	pos.x = 42;
+	pos.y = 43;
+	ds_window_move_req(wnd, &pos);
+
+	PCUT_ASSERT_INT_EQUALS(dsw_moving, wnd->state);
+	PCUT_ASSERT_INT_EQUALS(pos.x, wnd->orig_pos.x);
+	PCUT_ASSERT_INT_EQUALS(pos.y, wnd->orig_pos.y);
 
 	ds_window_destroy(wnd);
Index: uspace/srv/hid/display/window.c
===================================================================
--- uspace/srv/hid/display/window.c	(revision 338d09353f53dcb5fd2a315562bcd0b2588792d0)
+++ uspace/srv/hid/display/window.c	(revision 1e4a937d249f5477ae9be53bbb34c94e8942f19d)
@@ -436,4 +436,23 @@
 }
 
+/** Start moving a window, detected by client.
+ *
+ * @param wnd Window
+ * @param pos Position where the pointer was when the move started
+ *            relative to the window
+ * @param event Button press event
+ */
+void ds_window_move_req(ds_window_t *wnd, gfx_coord2_t *pos)
+{
+	log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_move_req (%d, %d)",
+	    (int) pos->x, (int) pos->y);
+
+	if (wnd->state != dsw_idle)
+		return;
+
+	gfx_coord2_add(&wnd->dpos, pos, &wnd->orig_pos);
+	wnd->state = dsw_moving;
+}
+
 /** Start moving a window by mouse drag.
  *
@@ -446,5 +465,6 @@
 	    (int) event->hpos, (int) event->vpos);
 
-	assert(wnd->state == dsw_idle);
+	if (wnd->state != dsw_idle)
+		return;
 
 	wnd->orig_pos.x = event->hpos;
@@ -467,5 +487,7 @@
 	    (int) event->hpos, (int) event->vpos);
 
-	assert(wnd->state == dsw_moving);
+	if (wnd->state != dsw_moving)
+		return;
+
 	pos.x = event->hpos;
 	pos.y = event->vpos;
@@ -497,4 +519,7 @@
 	    (int) event->hpos, (int) event->vpos);
 
+	if (wnd->state != dsw_moving)
+		return;
+
 	gfx_rect_translate(&wnd->dpos, &wnd->rect, &drect);
 
@@ -505,5 +530,4 @@
 	}
 
-	assert(wnd->state == dsw_moving);
 	pos.x = event->hpos;
 	pos.y = event->vpos;
@@ -559,4 +583,7 @@
 {
 	pos_event_t tevent;
+	gfx_coord2_t pos;
+	gfx_rect_t drect;
+	bool inside;
 
 	log_msg(LOG_DEFAULT, LVL_DEBUG,
@@ -564,18 +591,17 @@
 	    (int) event->hpos, (int) event->vpos);
 
-	if (event->type == POS_PRESS) {
-		if (wnd->state == dsw_idle)
-			ds_window_start_move(wnd, event);
-	}
-
-	if (event->type == POS_RELEASE) {
-		if (wnd->state == dsw_moving)
-			ds_window_finish_move(wnd, event);
-	}
-
-	if (event->type == POS_UPDATE) {
-		if (wnd->state == dsw_moving)
-			ds_window_update_move(wnd, event);
-	}
+	pos.x = event->hpos;
+	pos.y = event->vpos;
+	gfx_rect_translate(&wnd->dpos, &wnd->rect, &drect);
+	inside = gfx_pix_inside_rect(&pos, &drect);
+
+	if (event->type == POS_PRESS && event->btn_num == 2 && inside)
+		ds_window_start_move(wnd, event);
+
+	if (event->type == POS_RELEASE)
+		ds_window_finish_move(wnd, event);
+
+	if (event->type == POS_UPDATE)
+		ds_window_update_move(wnd, event);
 
 	/* Transform event coordinates to window-local */
Index: uspace/srv/hid/display/window.h
===================================================================
--- uspace/srv/hid/display/window.h	(revision 338d09353f53dcb5fd2a315562bcd0b2588792d0)
+++ uspace/srv/hid/display/window.h	(revision 1e4a937d249f5477ae9be53bbb34c94e8942f19d)
@@ -58,4 +58,5 @@
 extern errno_t ds_window_post_focus_event(ds_window_t *);
 extern errno_t ds_window_post_unfocus_event(ds_window_t *);
+extern void ds_window_move_req(ds_window_t *wnd, gfx_coord2_t *);
 
 #endif