INT 2fH 1709H: See if Data Will Fit in Clipboard

                                                    Compatibility:  WIN 3.0+ 
 Expects: AX    1709H
          SI:CX desired memory size needed
 Returns: DX:AX Largest block of free memory available to clipboard
                0000:0000 = error or no memory
    Info: This checks to see if a specified amount of data will fit into
          the clipboard.  It appears to call the Windows memory manager to
          have it rearrange moveable memory blocks to make room for a
          specified-size memory allocation.  Equivalent to

          Typical usage is to set SI (high word) and CX (low word) to the
          size of the data you intend to place in the clipboard.  Call this
          fn, and if DX:AX returns with the same or larger value, then its
          OK to go ahead with INT 2fH 1703H (put data into clipboard).

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