POSITION is a position specification. This is either a mouse button event
or a list ((XOFFSET YOFFSET) WINDOW)
where XOFFSET and YOFFSET are positions in pixels from the top left
-corner of WINDOW's frame. (WINDOW may be a frame object instead of a window.)
+corner of WINDOW. (WINDOW may be a window or a frame object.)
This controls the position of the top left of the menu as a whole.
If POSITION is t, it means to use the current mouse position.
You can also use a list of keymaps as MENU.
Then each keymap makes a separate pane.
-When MENU is a keymap or a list of keymaps, the return value
-is a list of events.
+
+When MENU is a keymap or a list of keymaps, the return value is the
+list of events corresponding to the user's choice. Note that
+`x-popup-menu' does not actually execute the command bound to that
+sequence of events.
Alternatively, you can specify a menu of multiple panes
with a list of the form (TITLE PANE1 PANE2...),