MDBLCLK()
 Determine the double-click speed threshold of the mouse
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 Syntax

     MDBLCLK([<nNewSpeed>]) --> nSpeed

 Arguments

     <nNewSpeed> is the maximum allowable amount of time between mouse
     key presses for a double-click to be detected.  This is measured in
     milliseconds.

 Returns

     MDBLCLK() returns the current double-click speed threshold.

 Description

     MDBLCLK() is a function used for determining and, optionally, changing
     the mouse's double-click speed threshold.  This is useful when the
     mouse's double-click sensitivity needs to be adjusted.