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  Sx_IsSem():

  Syntax:   Sx_IsSem([nOrder | cName])

            nOrder = Position of index in list of indexes
            cName  = Name for the semaphore file

  Returns:  Logical .T. if the semaphore-lock file exists.
                  .F. if an error occurred.

  Description:  This function is used to check for the existence of a
                semaphore-lock file using the name of an active index or
                a specified name.

                If an index order is specified, then the name of that
                index is used for the file.  The current index name (if
                any) is used if no argument is supplied.  The default
                extension for semaphore files is ".SEM".

  Example:  (See the example for the Sx_MakeSem() function.)