INT 2F - European MSDOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK
AX = 1400h
Return: AX = FFFFh if installed
BX = maximum memory required to save screen and keyboard info
CF clear if successful
CF set on error
AX = error code
0002h invalid function
0004h unknown error
Note:   the POPUP interface is used by background programs (see INT 21/AH=80h)
to communicate with the user
SeeAlso: AX=1402h"POPUP",AX=1403h"POPUP"

See also: 2F1401

2F1400 - European MSDOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK