Shortcut keys help provide an easier and usually quicker method of navigating and using computer software programs. Shortcut keys are commonly accessed by using the Alt (on IBM compatible computers), command key (on Apple computers), Ctrl, or Shift in conjunction with a single letter. The de facto standard for listing a shortcut is listing the modifier key, a plus symbol, and the single character. In other words, "ALT+S" is telling you to press the Alt key and while continuing to hold the Alt key, press the S key to perform the shortcut.
In addition to the shortcuts listed on this page, users can find the shortcut keys to their most popular program by looking for underlined letters in their menus. For example, in the picture to the right you'll can notice that the "F" in File has been underlined. This means you can press the Alt key and F to access the File menu. Note: Some programs require the user press and hold ALT to see the underlined characters. Finally, as can also be seen some of the common features such as Open (Ctrl+O) and Save (Ctrl+S) have shortcut keys assigned to them.