INT 16 - PC Tools v5.1+ DESKTOP API - PROCESS STANDARD MENU BAR
AX = FFFBh
Return: ???
Notes:  available only when popped up
performs input processing on the standard menu bar set up with AX=FFFAh

See also: 16FFF7

16FFFB - PC Tools v5.1+ DESKTOP API - PROCESS STANDARD MENU BAR