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   PLSWAIT()       Pops up a Please Wait window/or removes it
     Usage         PLSWAIT(<T/F>,[<MESSAGE>,<T,L,B,R>])
     Params        .T. - PUTS WINDOW ON SCREEN   .F. - REMOVES WINDOW
                   optional MESSAGE  - default is 'Please wait...'
                   optional T,L,B,R  - default is centered
     Example
                   PLSWAIT(.T.,"I'm thinking...")
                   ...code...
                   ...code...
                   ...code...
                   PLSWAIT(.F.)