Feeling hard to press CTRL+ALT+DEL to lock your machine? Try this and
Create or you may just press winkey+l in XP or vista but this one is
applicable to all versions
the icon to lock the machine on your desktop .

1. Right click an empty spot on the desktop, point to New and click
Shortcut.
2. In the Create Shortcut dialog box, copy the following into the 'Type
the location' of the item text box:
"rundll32 user32.dll, LockWorkStation" remove quotes while typing.
3. Click Next.
4. In "Type a name for this shortcut", type LOCK and Click Finish
5. Now just click on that icon and enjoy