INT 50 - Vanderaart TEXT WINDOWS - EDIT LINE IN WINDOW
        AX = 0006h
        ES:BX -> text string
        CH = type
            00h everything
            01h uppercase only
            02h positive numbers
            03h Dutch postal code ("9999 AA")
            04h 'J' or 'N' (Dutch yes/no)
            05h telephone or FAX number
            06h positive or negative number
            07h date (dd/mm/yy)
            08h money
            09h '1' through '8'
            0Ah '1' through '4'
            0Bh uppercase filenames
        DH,DL = row,column of upper left corner
        DI = window handle
Return: AX = key which terminated entry
            0000h Enter
            0001h Esc
            0002h Down arrow
            0003h Up arrow
            0004h F10