"Pop up a deck-of-cards menu and return user's selection.\n\
POSITION is a position specification. This is either a mouse button event\n\
or a list ((XOFFSET YOFFSET) WINDOW)\n\
-where XOFFSET and YOFFSET are positions in characters from the top left\n\
+where XOFFSET and YOFFSET are positions in pixels from the top left\n\
corner of WINDOW's frame. (WINDOW may be a frame object instead of a window.)\n\
This controls the position of the center of the first line\n\
in the first pane of the menu, not the top left of the menu as a whole.\n\