This is documentation for Mathematica 5, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

Documentation / Mathematica / The Mathematica Book / Mathematica Reference Guide / Evaluation /

A.4.3 Overriding Non-Standard Argument Evaluation

Overriding holding of arguments.

By using Evaluate, you can get any argument of a function evaluated immediately, even if the argument would usually be evaluated later under the control of the function.