The "View user" page show user's profile, his recent tickets, his recent replies and links to view all his ticket, either closed or "in progress". You can see the user's IP address, user-agent, assets assigned to the user and last time has logged in to the helpdesk web-app
Click the "edit" button to edit the user profile and permissions (available to administrators only or if you're looking at your own profile)
If you have enabled the "user lookup" feature, this page will show whatever information it pulled from the external source you set up in the Admin-panel. Read more about this feature here.