Security access control routine
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 Syntax

        H_ControlAccess()

 Arguments:

      None

 Returns:

      NIL

 Description:

      This function allows a supervisor to add, delete and maintain other
      user accounts within the system.  On entering the function, the user
      is prompted for their password.  If the password is successfuly
      entered, a list of users that have access to the system is displayed.

      The supervisor can : Add new users
                           Delete old users
                           Change a users access level, name and logon status
                           Clear a users password

      The current user should have Supervisor level access.

      This version of AccessControl is for systems with a Supervisor at
      Level 0

 Examples:



 Header File: H_LIB52.CH

 Source: ACCESS.PRG

 Author:  Martin Colloby