NASLite Network Attached Storage

Can I shutdown safely with a keyboard shortcut, like CNTL-ALT-DEL for reboot? I'd like to easily shutdown without having to telnet into the box. IF such a shortcut exists (I doubt it) I'd sure appreciate knowing it! I set up a headless server (full blown Linux) and used a homemade serial port cable to mimic a UPS signal to shutdown, ie - press the switch and the PC goes into shutdown mode.