There must be a key command to move between the grid panel or the filmstrip and the keywording panel, isn't there? I don't want to use my mouse. I just want to select the photo (if I'm in the grid panel I just move right arrow or left) and then go to the keywording panel (Command K) and then GET BACK TO THE GRID PANEL SO I CAN SELECT THE NEXT PHOTO. I've looked at a lot of articles and lists of key commands for Lightroom 4 and can't seem to find the answer.
In case this helps, pammmm, the Esc key is used in many programs to back out of ("escape" from) a lot of places. For example, if you're in a dialog box, pressing Esc is usually the same as clicking the Cancel button. You'll find the Esc key used in this way in all kinds of programs, from Photoshop to Microsoft Word.
It is possible that the reason Esc isn't documented is because it isn't documented in a lot of other programs either. It's probably just assumed as a "power user" shortcut, the same way a lot of people know that they can press Enter instead of clicking OK.