An apple has been equated to human brain.
Missing piece signifies the knowledge you will acquire using the apple computer.
Macintosh Apple.
because of following reason it is bcoz of ddocument not printed restart your system
my friends icon is missing when she is in chat, Why?
Apple
In the upper left corner of the screen, marked by a small Apple icon. (Only on Apple computers.)
You can only do this on the Mac operating systems. Press Alt (Option) + Shift + K. That gets you the Apple Icon. :) 
smack it against a hard surface
i got it
To get money, fame and an awesome Icon.
book
Icon
you go to your stable and on the right of the screen theres a box and theres 3 icons: a horse icon, a apple icon, and a horse bit icon. click on the apple icon and there should be food. click on an apple or any other thing that you can feed your horse and click on it and put it on your horses mouth and click it. When you click the food the food should be the cursor/mouse