Interesting thought: the three most popular games on Steam[1] (Team Fortress 2, Counter-Strike, and Counter-Strike Source) and the two most popular games on Xbox Live[2] (Modern Warfare 2 and Black Ops) are all based on Quake's engine to some extent.

[1] http://store.steampowered.com/stats/ [2] http://majornelson.com/2011/08/10/live-activity-for-week-of-...

Is it usual in games to perform prediction in single-player?

Also interesting note regarding readability of bitwise operations at the end of the Networking section.

Edit: Found more about this exact substitution on Wikipedia, of all places. :)

http://en.wikipedia.org/wiki/Modulo_operation#Performance_is...

Very cool. More code reading posts, please! :)