INT 10 - BIOS Window Extension v1.1 - GET WINDOW COORDINATES
        AH = 11h
Return: CH,CL = row,column of upper left corner
        DH,DL = row,column of lower right corner
Program: BWE is a TSR by John J. Seal published in May 1986 Dr. Dobb's Journal
SeeAlso: AH=12h"Window"