ASP.NET 2.0 #6: Personalization

Here's the code by which one authorized user can access another's personalization data: 

branch = Profile.GetProfile(userName).Branch;

<Yawn/> That's well documented.  

But here is the code by which the authorized user can MODIFY another's personalization data, which is not so well documented:

ASP.HttpProfile profile = Profile.GetProfile(userName);

profile.SetPropertyValue("Branch", branchKey);

profile.Save();