DEFAULT <p> TO <val> [,<pn> TO <valn>]
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Purpose: Default parameters in a function parameter list to
         expressed values.

Parameters: p   - 'P' Parameter name.
            val - 'X' Value

Example: FUNCTION wFrame( wFtype, wfColor, wHndl, lTitles )
         DEFAULT wFcolor TO _wFColor(), ;
                 wFtype TO _wFrame(), ;
                 wHndl TO _twHandle(), ;
                 lTitles TO .T.