To help assist users and diagnose issues when administering Salesforce, particularly when trying to understand users access to records or personal reports, you can log into Salesforce as that user record.
The facility for logging in as another user is accessed by navigating to Setup | Manage Users | Users. Now, click on the Login link next to the name of the user record, as shown in the following screenshot:
Alternatively, you can access the facility for logging in as another user within the User Detail page and clicking on the Login button, as shown in the following screenshot:
After you have logged in as another user, you will notice a message in the top-right corner of all Salesforce pages that displays the user you are currently logged in as.
To return to your administrator account, first of all, locate the user's name at the top-right of...