http://drupal.org/project/devel also has a block to do this if I remember correctly
 
----- Original Message -----
From: Steve Edwards
To: support@drupal.org
Sent: Friday, December 05, 2008 3:50 PM
Subject: Re: [support] Drupal sudo

Check out the Administration Menu module (http://drupal.org/project/admin_menu).  It allows you to switch users without logging out.

Steve

Christopher M. Jones wrote:
Is there a module that enables me to switch user and / or role without 
logging out and back in? The one aspect of D development that bugs me 
most is logging in and out to test permissions settings and whatnot.

I looked on drupal.org and didn't see anything. Maybe I missed it.
  


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