ShowTime() - Show and update a clock on the screen
 Allows you to have a real-tim clock on the screen
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 This function is here for compatibility reasons only. It's only function in
 life is to stop an 'Unresolved External' message at link time.

 Syntax

     ShowTime( [<nRow>], [<nCol>], [<lMode>],  [<cAttr | nAttr>],
        [<l12/24>], [<lAM/PM>]) --> cNull

 Returns

    ShowTime() always returns a null string "".

 Files:  Library is MRWINDOW.LIB.