Shortcuts: Clear Memory, Lock Workstation, Restart, Shutdown, Change Icon

Recently, while I was tweaking the Windows installed on my laptop, I discovered four shortcuts which I thought were cool and decided to pass them along.
The first is a shortcut to shut the system down. Caution when using this one as it gives no prompt after being run it simply ends all processes and calls the command to power down the system. Any unsaved data will be lost. These should work in both vista and XP.
The second is similar except that it reboots the system. Since it does its job in the same way as the first one you should take the same caution in using it.
The third logs of the current user.
Note that none of these first three will ask you if your sure you want to execute them, they simply do what their told: kind of a “Don’t pass go, don’t collect $200″ thing. If you run, say, the restart shortcut, it will simply restart the system; no dialogue boxes, no second chance, no stopping it. USE WITH CAUTION.
The forth shortcut runs a system32 dll file which, to the best of my knowledge examines all running processes and if any are idle it is should free up whatever memory they were using. This should be handy if you want to run a 3d application or other memory-intensive task on a system with not much memory. Simply run the shortcut before you start the application and then after a few seconds start the application itself.