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 SPXInstalled()
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 Purpose:
 Verify if SPX is installed.

 Syntax:
 bResult = SPXInstalled()

 Parameters:
 None.

 Returns:
 A boolean value (TRUE or FALSE).

 The CA-Clipper name for this function is:
 SPXInstalled()

 Description:
 SPXInstalled() returns TRUE if SPX is installed, FALSE if not.

 Example:
 // To find out if SPX is loaded:
 if( SPXInstalled() )
    ? "SPX is installed"
 else
    ? "SPX is NOT installed"
 endif