INT 16 U - PC Tools v5.1-8.0 DESKTOP - INVOKE NOTEPAD EDITOR
        AX = FFF6h
        DS = segment of editor buffer structure (see below)
        BX = ???
        DX = segment of window parameters structure (see AX=FFB5h)
Return: ???
Note:   available only when popped up
SeeAlso: AX=FFF4h

Format of editor buffer structure:
Offset  Size    Description
 00h    WORD    offset of current cursor position in buffer segment
 02h  2 BYTEs   ???
 04h    WORD    offset of beginning of file data in buffer segment
 06h 10 BYTEs   ???
 10h  N BYTEs   ASCIZ name of file being edited

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