To remove a user account (FredQuimby, who logs in as "fred"):
If you are using a .htpasswd file, edit the .htpasswd file to delete the line starting fred:
Remove the FredQuimby - fred line from the Main.TWikiUsers topic
Remove FredQuimby from all groups and from all the ALLOWWEB/ALLOWTOPIC... declarations, if any. Note: If you fail to do this you risk creating a security hole, as the next user to register with the wikiname FredQuimby will inherit the old FredQuimby's permissions.
[optional] Delete their user topic Main.FredQuimby.
Note: Consider leaving the user topic file in place so their past signatures and revision author entries don't end up looking like AnUncreatedTopic . If you want to make it clear the user is no longer with the organization or has been banished, replace the topic content with a note to that effect. The existance of the UserName topic should also prevent that user name from being re-used, sealing the potential security hole regarding inherited permissions..