It allows you to keep contacts, e-mail campaigns, files and reports together under seperate clients so that there is no fear of sending an e-mail campaign to another client's/site's contacts!

You can easily switch between clients at any time by using the Change link in the top right hand corner of the screen.

By default all accounts have one client setup (called Default Client).  If you would like to add more just click on the Options tab and then View All Clients.

For more information see the article in our Help Centre titled Setting up clients within Suite26.