For Windows XP:
SHUTDOWN – press the WINDOWS KEY and the letter “U” twice
RESTART – press the WINDOWS KEY, then the letter “U” once and then the letter “R” once
LOGOFF – press the WINDOWS KEY and the letter “L” twice
SLEEP – press the WINDOWS KEY and the letter “U” once and the letter “S” once
For Windows Vista/Windows 7:
SHUTDOWN – press the WINDOWS KEY, then press the RIGHT ARROW key three times and the letter “U” to shut down
RESTART – press the WINDOWS KEY, then press the RIGHT ARROW key three times and the letter “R”
LOGOFF – press the WINDOWS KEY then press the RIGHT ARROW key three times and the letter “L”
SLEEP – press the WINDOWS KEY, then press the RIGHT ARROW key three times and the letter “S”