Effective Vs. Real
Unix processes have an effective (EUID, EGID), a real (UID, GID) and a saved (SUID, SGID) ID. Normally these are identical, but in setgid processes they are different.
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Famous quotes containing the words effective and/or real:
“Before anything else [Numa] decided that he must instill in his subjects the fear of the gods, this being the most effective measure with an ignorant, and at that time uncultured, people.”
—Titus Livius (Livy)
“I’m here because you believe I’m here. Keep on believing and I’ll always be real to you.”
—Philip Dunne (1908–1992)