BSCW lets you search for users -- either in your own Address Book or among all registered users of the server ('the whole system'). The second option can be particularly helpful if you want to invite someone into a workspace who is a user but whose user name and email address you do not (yet) know precisely.

As search criteria, you may specify fields of the 'Details' form, which every registered user had the opportunity to fill in. On many BSCW servers, however, the only information that is likely to be known for each user is 'user name' und 'email address'.

In the result page returned from a BSCW user query, you may trigger various actions for users listed therein, e.g., you may include them in your address book ar send them an email message.