To obtain an ALT Character:
1: Make certain that the Num Lock key has been pressed to activate the numeric key section of the keyboard.
Depress the Alt key.
2: While the Alt key is depressed, type the proper sequence of numbers (on the numeric keypad) of the ALT code from the table above.
3: Release the Alt key, and the character will appear.
cool eh? *awaits someone to say they already knew about this...*