FT_MCONOFF()
 Turn mouse cursur off if in specified region
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 Syntax

     FT_MCONOFF( <nTop>, <nLeft>, <nBottom>, <nRight> )

 Arguments

    <nTop>, <nLeft> <nBottom> <nRight> are the four corners of the
          screen region in row and column coordinates.

 Returns

    NIL

 Description

    This function tells the mouse driver to hide the cursor if it is in
    the given region. The driver hides the cursor by decrementing the cursor
    flag. A call to FT_MSHOWCRS is required to turn the cursor back on.
    Calling FT_MSHOWCRS also disables this function.

    See FT_MSHOWCRS for a discussion of the cursor display flag.

 Examples

    FT_MCONOFF( 10, 10, 11, 20 )

 Source: MOUSE1.PRG

 Author: Leo Letendre