INT 15 - TopView - SEND MESSAGE - "GETSCALE" - GET POINTER SCALE FACTOR
AH = 12h
BX = 1200h
STACK: DWORD object handle for pointer
Return: STACK: DWORD pointer pos scaled as if window were this many colums wide
DWORD pointer pos scaled as if window were this many rows high

See also: 1512

1512 - TopView - SEND MESSAGE - "GETSCALE" - GET POINTER SCALE FACTOR