INT 2F - Kingswood TSR Windows - OPEN WINDOW
AX = 3901h
BL = 02h
Return: AX = error code (0000h if successful)
Notes:  opens the next TSR window on top of any others.  Only three
TSR windows can be opened at any one time.  The three windows
are all 40x11 characters, partly overlapping.
SeeAlso: AX=3901h/BL=03h,AX=3901h/BL=05h,AX=3901h/BL=06h

See also: 2F39

2F3901BL02 - Kingswood TSR Windows - OPEN WINDOW