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INT 2F - Multiplex - MS WINDOWS - RELEASE CURRENT VIRTUAL MACHINE TIME-SLICE
        AX = 1680h
Return: AL = 00h if the call is supported
        AL = 80h (unchanged) if the call is not supported
Notes:  programs can use this function, even when not running under Windows in
          386 enhanced mode, because OS/2 can use the call to detect idleness
          even though it does not support the complete enhanced Windows API.
        this call will be supported in OS/2 2.0 for multitasking DOS
          applications
        does not block the program; it just gives up the remainder of the time
          slice
        should only be used by non-Windows programs
SeeAlso: INT 15/AX=1000h