Indicates if the print queue has been stopped

    Syntax:

         pError() -> lError

    Description:

         Indicates if Print has detected any error or problem and has
         stopped the queue.
         Check that PRINT.EXE is installed before using this function.

    Return:

         .T. if there is error or .F. if there is not error.

    Example:

         If ! pError()
           Warning ( "Ok" )
         EndIf