Inhibit logons by setting a semaphore
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 Syntax

        H_InhibitLogOn( cText , lCheck )

 Arguments:

      cText  - Text to output to batch file
      lCheck - If .T., check to see if users are logged on

 Returns:

      .T. if lCheck is .F.
      Otherwise returns .T. if users are not logged on

 Description:

      The text cText is written to the batch files H_BATCH, which must
      be present in the TABLES directory (as must it's audit table).  This
      text will appear on screen when a user attmpets to logon.

      The sempaphore can be cleared by calling H_EnableLogOn()

 Examples:

      Stop users from logging on during batch processing :

          H_InhibitLogOn( "Batch processing in progress" , .T. )

 Header File: H_LIB52.CH

 Source: INHIBLOG.PRG

 Author:  Martin Colloby