INT 2F - Kingswood TSR Windows - CLOSE WINDOW
AX = 3901h
BL = 05h
Return: AX = error code (0000h if successful)
Notes:  Close the last opened TSR window.
SeeAlso: AX=3901h/BL=02h

See also: 2F39

2F3901BL05 - Kingswood TSR Windows - CLOSE WINDOW