Hi Brendon,
Correct. Any combination of keystrokes separated by hyphens means "Press and hold all keys except the last in the list, then tap the last key, then release all."
Other examples:
shift-command-3 (takes a screen shot and saves it as a file on the desktop)
shift-command-4 (changes the mouse pointer to a cross hair, with which you can select a portion of the screen. Takes a screen shot of the enclosed area when the mouse in released, and saves it as a file on the desktop.
shift-control-command-3
shift-control-command-4 These take the screen shots described above, but place the result on the Clipboard, not in a file.
option-return or option-tab should place a return (or tab) into the Find or Replace box depending where you have the insertion point. You should see a Pilcrow symbol ( ¶ ) in the box. Example below (in Numbers '09).
Regards,
Barry