The Members page of a Workspace provides a list of the users and the BSCW groups that are currently members of the Workspace (the BSCW group 'Members of <Workspace name>'). Its button bars offer the functionality you need for membership administration.
In addition, the entries let you access information on the individual members.
The entries in the Members page list the invited members of the Workspace. This includes
A membership is pending if a person was invited but has not yet registered as a user of the BSCW server. This person cannot use the shared Workspace until registration is completed.
A person whose membership is pending can be reminded to register:
to send another invitation to the email address.