This will allow a user to easily turn DEP on or off. DEP can cause some programs to crash, and as such you may need to turn it off. As a plus, for system where DEP is grayed out by windows, you can still enable DEP with this tool. DEP will still be grayed out, but it will be working.
Personal note: I have to keep DEP off on my system for some older programs that I use will work. With DEP on these older programs crash.

DEP is a security feature that can help prevent damage to your computer from viruses and other security threats. DEP can help protect your computer by monitoring programs to make sure they use system memory safely. If a program tries running (also known as executing) code from memory in an incorrect way, DEP closes the program.