That is done in Unix/Linux/Clones and should also apply in the Windows world.
Please see:
http://en.wikipedia.org/wiki/Principle_of_least_privilege
Principle of least privilege
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In information security, computer science, and other fields, the principle of least privilege, also known as the principle of minimal privilege or just least privilege, requires that in a particular abstraction layer of a computing environment, every module (such as a process, a user or a program on the basis of the layer we are considering) must be able to access only such information and resources that are necessary to its legitimate purpose.[1][2]
When applied to users, the terms least user access or least-privileged user account (LUA) are also used, referring to the concept that all users at all times should run with as few privileges as possible, and also launch applications with as few
Under Windows XP, here is a good tutorial on how to accomplish this with the help of the "Run As" command, similar to "su" in Unix.
http://www.safecomputing.umich.edu/events/download/RunAsUser_sumit_05.pdf
Google: http://www.google.com/#hl=en&source=hp&q=run+as
Results 1 - 10 of about 141,000,000 for run as. (0.27 seconds)
How do you like them Apples?
