INT 2fH 1701H: Get Access to Clipboard

                                                    Compatibility:  WIN 3.0+ 
 Expects: AX    1701H
 Returns: AX    0000h = clipboard already open (fn failed)
                else  = opened successfully
    Info: You must use this fn before any other clipboard fns.  It enables
          INT 2fH access to the clipboard by giving ownership to the window
          displayed by the WinOldApp program.  Equivalent to OpenClipboard.

          Be sure to use INT 2fH 1708H (close clipboard) when finished
          accessing the clipboard.

See Also: INT 2fH 17xxH: Windows Clipboard Functions
          INT 2fH: Multiplex Interrupt
          DOS Functions