Attempt to USE a dbf with optional retry
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 Syntax

        H_NetUse( cDatabase, lOpenMode, nSeconds , cAlias )

 Arguments:

      cDatabase - Table to open
      lOpenMode - Mode to open
      nSeconds  - Number of retries allowed - 0 for infinite number
      cAlias    - Alias for file - defaults to cDatabase

 Returns:

      .T. if successful, .F. otherwise

 Description:

      Attempts to open the table.  If it fails, waits a second and retries.
      After nSeconds retries it aborts.

 Examples:



 Source: NETUSE.PRG

 Author:  Martin Colloby