Even though I know the answers to these myself, a friend of mine would like this in writing, so that he can show it to his players
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1. Does the Tower Shield Proficiency feat remove the -2 penalty to attack rolls caused by the tower shield?
2. Do enhancement bonuses on armor and shield stack when determining your AC?
3. Does the enhancement bonus on a bow apply to both attack rolls and damage the arrow deals?

1. Does the Tower Shield Proficiency feat remove the -2 penalty to attack rolls caused by the tower shield?
2. Do enhancement bonuses on armor and shield stack when determining your AC?
3. Does the enhancement bonus on a bow apply to both attack rolls and damage the arrow deals?