Use a DBF file shared or exclusive.
──────────────────────────────────────────────────────────────────────────────

 Syntax

        GT_Use(<cFile>,[<lExclusive>],[<cAlias>]) -> cAlias

 Arguments:

      <cFile> is the name of the file to open.

      <lExclusive> use file shared or exclusive.

      <cAlias> is the alias to use if successful.

 Returns:

      cAlias

 Description:

      Use a DBF file shared or exclusive.

 Examples:

      // Open a DBF file exclusively
      IF EMPTY(GT_Use('INVS0293',.T.,'INVOICES'))
          ? 'Error'
      ENDIF

 Source: GT_USE.PRG

 Author:  Martin Bryant