I've only been a Mac-convert for about a year and a half now, and one thing I've never really understood is keychain. Without bogging you down with useless facts I just have a simple question. Can I password protect my lock screen but nothing else? I don't want to have to type in my password to change things, uninstall things, etc. I thought maybe unlocking that lock "thing" in system prefs would work, but I guess that's not what it's for. Thanks.