Compatibility: WIN 3.0+
Expects: AX    1700H
                                                                  
Returns: AX    1700H = Clipboard fns are not available
else  = AL= major version number
AH= minor version number
                                                                  
Info: Use this to see if you are running in a DOS session under Windows
and to see if clipboard support is available.  Equivalent to
IdentifyWinOldApVersion.

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INT 2fH 1700H: Is Clipboard Available?