Actually they don't have any behavior blocker. They have some Components like Registry Protection, File Modification Protection & things like that. The Problem with these Components is that they Block Legitimate Programs as well. For ex. It blocked my Windows Manager 1 Click Cleaner while it was Removing dead Registry keys.
Being a Programmer other Problem that i face while using 360 is that it Blocks my each & every C/C++ Program that i create with my Compiler(you won't have to face this Problem if you are using Turbo C). You'll have to White list your Projects.