Password Protect any application.

Don't know how to do this?

Then EMPHATY is for you.

Empathy is a special utility allowing you to password-protect any executable file. Empathy can modify an EXE file so that it will require a password to run. Only a person knowing the password will be allowed to run the protected program.

Empathy is postcardware. You can use it freely for an unlimited period...

Google Web Security.

Hehe today I found intresting video, IMHO it's very logical idea for Google since Google has the information about practically everything.