|Shows the popup menu <popup_name> at the current cursor position,
eventually passing the [parameters]. Please note that you can't
use this command inside one of the defpopup command
handlers for <popup_name>. In other words, you can't "popup
a popup" while it is being popped up. :) (This would
be an endless recursive behaviour).
If the -p switch is used , then <screen_coordinates> must be
in the form <x>,<y> and will be used as screen coordinates
for the placement of the popup (instead of the current cursor position).