Google App Engine vs. Google Apps?

What is the difference between the two

[eahn]

Hello:

I'm a newbie, so sorry if this is a stupid question. I have 3 parts to this question.

1. I just signed up 2 domain names through Google, which in turn is registered through enom (I didn't know this at first). Anyway, they both have Google Apps associated with them. I don't know the difference between google App Engine and google apps. Can anyone explain it to me?

2. I find out after the fact that I cannot use one of my domain names as a domain alias because I purchased both through Google partner, and they both have Google Apps accounts. Is there a way to get around this?

3. At this time, I just want to use [e-mail] for internal email only for the 3 people in my startup company. Interestingly enough, if I type www.mydomain.com, my startup page shows up. I really don't want the whole world to be able to see this site yet. How do I prevent the whole world from seeing this site?

Thank you in advance for your help!

Esther

[mauiexpo]

Just put an under construction page as your index.