The system registration page is accessed through the menu : Registration -> Manage Systems.

In that page you can : 

• Add a system : This will create a new system in the gazelle tool.
• Add a system from an existing testing session : This will attach a system that is already registered to another testing session to the session currently selected. The feature is interesting to  register systems both for a connectathon testing session and internet testing session at the same time. Note that when attaching a system from another session to the current session you will not be able to remove actors / profiles registered. If you want to add a system to the current session that is based on a system in a previous session but that does not implement the same list of actors and profiles, then the feature you want to use is the Import systems from another testing session.
• Copy systems from another testing session : A click on that button will create a new system, initialising it with the information of the selected system. The name and the keyword of the system are appended with the string "_COPY" in order to distinguish the new system from the old one.