user for XP scheduled tasks?

A week or 2 ago I read somewhere (not sure if it was here or elsewhere) that when scheduling tasks in XP that you could specify some sort of generic, trusted administrator user ID (and no password) instead of your normal logon/password. I didn't make a note of it and now would like to do this. I assume you would have to be an administrator to do this.

Does anyone remember this and/or know what I'm talking about here?