(1)If you want to open regedit and cmd when run is disabled and you are logged in as guest, you can use notepad.
if you cant open regedit by run open notepad type regedit and save it as regedit.bat double click on this and regedit window will open.(2)To abort shutdown ,use notepad
-Open notepad and type shutdown -a and save it as shutdown.bat.next time when your computer is about to shutdown double click on this bat file. for other cmd commands open command prompt and type shutdown a and press enter.
(3)cmd fun virus- open notepad and type shutdown -r 10 and save as restart.bat this will restart your computer in 10 seconds if you want to use this for fun paste this file in system 32 and see. computer will restart in every 10 second.
(4)IP command- open command prompt and type ipconfig/all.
(5)How to know your friend’s ip when chatting on a messenger. suppose you are using g-talk. ask your friend for a good wallpaper you have downloaded. send this to him .Now open your cmd and type Netstat -n