FT_MHIDECRS()
 Decrement internal mouse cursor flag and hide mouse cursor
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 Syntax

     FT_MHIDECRS() -> NIL

 Arguments

    NONE

 Returns

    NIL

 Description

    Hides the mouse cursor. Make sure to turn the mouse cursor off when
    redrawing screens.  The mouse cursor dutifully saves the screen
    under it, so if you draw over the mouse cursor it will create a
    "hole" in your screen when you move the mouse cursor.

    Note: A call to FT_MHIDECRS() decrements a mouse driver variable
    which indicates whether the cursor is shown. The cursor is visible
    only when the variable = 0. Thus multiple calls to FT_MHIDECRS()
    require an equal number of calls to FT_MSHOWCRS() before the cursor
    will again be visible. Once the variable is 0 calls to FT_MSHOWCRS()
    does not increment the varaible above 0.

 Examples

    FT_MHIDECRS()
    @ 10, 10 to 20, 20
    FT_MSHOWCRS()

 Source: MOUSE1.PRG

 Author: Leo Letendre