In E-Mail-marketing we use clients, which separate you contacts in your account to use more communication channels (like, event, landing page, newsletter,...). In that way you can create clients for each of your department areas (B2B, B2C, internal e.g.).
Every client in the account use the same user data. When you change for example the name of one address, it will be changed in all clients to have consistent data. Only the date of the registration to that client and the status of the contact (signed in, signed out, waiting for confirmation) will be saved for each contact in each client. When a user sign's off in one client, that user will still be signed-in in other clients.
Regarding from your marketing-suite, you have access to the Suite-Manager. On the left grey area you will find a button called clients, where you can edit the name, forward address and reset your transaction PIN-code. Also you can set sharing rights for articles, pictures, documents for this and other clients.
There is also the possibility to implement web-tracking for your campaigns in your client with the section Webanalytics in the client-settings.