I search for solutions in this order: Past Code, Unreal Source, Wiki, BUF, groups.yahoo, google, screaming at monitor. – RegularX
From Unreal Wiki, The Unreal Engine Documentation Site
Unreal Wiki uses a collaborative type of web software called a wiki and encourages anyone who creates content for Unreal Engine games to participate. The site itself is run by only a few admins, while the actual content is created and maintained by the entire Unreal editing community. This includes especially mappers, modders and modelers new to the Unreal Engine, because if you are new to something, you have a different view on things than more experienced editors. Because of this, new contributers can often put a subject in words that are easier to understand for other new mappers, modders or modelers.
Whether you are new to Unreal editing or already an experienced member of the editing community, please help the other members of the Unreal editing community by adding and improving content on Unreal Wiki.