How to create a headless user in active directory?

I want to create a headless user in AD, could someone please suggest me on how to do it? Thanks!
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A what? Please explain.
Edit: I think I got an idea by now. You mean a user not used by a fellow worker but for special tasks? An account that has certain restrictions? If so, please specify what exactly you plan to do with that account.
DO you mean a service account/ an account used by a Windows service only?
beer9Author Commented:
appreciate if I can get help in both.. :-)
Managed service accounts were a feature of server 2008R2. Since 2012, there are group managed service accounts.

Also, for both cases, you can use the local system account.

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