INT 15 - TopView - "GETVER" - GET VERSION
AX = 1022h
BX = 0000h
Return: BX nonzero, TopView or compatible loaded
(BL = major version, BH = minor version)
Notes:  TaskView returns BX = 0001h, DESQview v2.00+ returns BX = 0A01h


151022BX0000 - TopView - "GETVER" - GET VERSION