INT 15 - DESQview/X 1.02 - DVDOS4GX.DVR - ???
AX = BFDEh
BX = 0005h
CX = new value for ???
Return: BX = 0000h (success)
AX = old value of ???
DS:SI -> ??? (if AX nonzero on return)
ES:DI -> ??? (if AX zero on return)
Note:   called by DOS4GW.EXE

See also: 15BFDE

15BFDEBX0005 - DESQview/X 1.02 - DVDOS4GX.DVR - ???