INT 50 - PC Thuis Organizer Shell - EDIT LINE
        AX = 000Dh
        ES:BX -> text string
        CL = length
        CH = type
            bit 0: force uppercase
            bit 1: integer
            bit 2: no spaces allowed
            bit 3: no cursor keys
        DH,DL = row,column of upper left corner
        DI = window handle
Return: AX = result code
Program: The PC Thuis Organizer Shell was written by John Vanderaart and
          published in the June/July 1990 issue of PC Thuis Power magazine

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