Several presenters at events such as TechEd and ITForum make use of a a really handy utility named "whoami". It's a resource kit utility that you can use to query attributes from your user context. Those of you who have experience of UNIX shell commands will already be familiar with a very similar command.
The image below shows the typical output for an administrative user running on Windows XP.
You can download the utility for yourself (for free) by clicking here.