INT 50 - Vanderaart TEXT WINDOWS, PCIBM PC Thuis Shell - OPEN TEXT WINDOW AX = 0000h ES:BX -> name string or ES:0000h if none CH,CL = row,column of upper left corner DH,DL = row,column of lower right corner Return: AX = window handle or 0000h if not installed FFFFh on error SeeAlso: AX=0001h,AX=0002h"TEXT WINDOWS"