Site-level preferences are located in TWiki.TWikiPreferences, however this Main.TWikiPreferences prefs topic has override priority and should be used for local customisations. This allows for easier upgrades as you don't need to worry about the shipped preferences clobbering yours. It's easier to keep a handle on if you only copy over the settings you actually change.
Quick edit of existing preferences (edit the topic text to set new preferences)
FINALPREFERENCES locks site-level preferences that are not allowed to be overridden by WebPreferences or user preferences:
Set #BROADCASTMESSAGE = NOTE: This TWiki installation has been upgraded to version 4.2 on january 26th 2008. The most notable change is in the behaviour of the edit button: by default you will get into wysiwyg mode. If you want the old behaviour look for the link 'raw edit' on the bottom of the topic.