The first level of security lets you specify whether or not remote workgroups may connect to you at all. This may be specified in the Security page of the Remote Workgroup Options dialog box.
You may separately specify whether remote workgroups may:
replicate your workgroup
mirror your workgroup
access your workgroup directly
Do this by checking the appropriate check box in the Security page. For each option, you may supply an optional password. If you do this, then each remote workgroup that wishes to connect to you must supply the same password when defining the connection. This provides a further level of security.