Chapter 3 Authentication for FortiOS 5.0 : Managing Guest Access
  
Managing Guest Access
Introduction
Visitors to your premises might need user accounts on your network for the duration of their stay. If you are hosting a large event such as a conference, you might need to create many such temporary accounts. The FortiOS Guest Management feature is designed for this purpose.
A guest user account User ID can be the user’s email address, a randomly generated string, or an ID that the administrator assigns. Similarly, the password can be administrator-assigned or randomly generated.
You can create many guest accounts at once using randomly-generated User IDs and passwords. This reduces administrator workload for large events.