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  • PRG45 - Как yзнать, в FS ли DOS-сессия?

    From FAQServer@2:5020/181 to All on Thu Apr 9 07:37:16 2026
    [Q]: Как yзнать, в FS ли DOS-сессия?

    [A]: Alexander Perezhogin (2:5007/2.1)

    INT 2F C - OS/2 compatibility box - SWITCHING DOS TO BACKGROUND

    AX = 4001h
    Note: called by OS/2 when the DOS box is about to be placed in the
    background and the video driver should save any necessary state
    SeeAlso: AX=4002h,AX=4005h

    INT 2F C - OS/2 compatibility box - SWITCHING DOS TO FOREGROUND

    AX = 4002h
    Note: called by OS/2 when the DOS box is about to be placed in the
    foreground and the video driver should restore the previously-saved
    state
    SeeAlso: AX=4001h,AX=4006h

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