You can asign the shortcut key to command prompt
Many Windows users miss this feature. For each shortcut in your Start menu, you can associate a hotkey with it. Right click on Start->Programs->Accessories->Command Prompt. Click Properties.
Click on the text field of Shortcut key and press Ctrl-Alt-Z. Then click OK.
Now no matter where you are, pressing Ctrl-Alt-Z will get you to the command prompt.