Some questions - MySQL Cluster (no replies)

Hello everyone.
I created a new topic differentiate my two machinations.

I have currently implemented this with MySQL Cluster:

- 2 data nodes (Windows 7)
191.168.2.251
191.168.2.252
- 2 SQL nodes (API) - (Windows Server 2008)
191.168.2.2
191.168.2.3
- 2 Managers node (Windows Server 2008)
191.168.2.2
191.168.2.3

The cluster appears to work correctly, if a PC is dead, we always access to data, if the DATA down, you can still also.

Now I'd like to do two things, and therefore these are my questions:
- The users / programmers need access to MySQL course, however, I would like to ensure it only uses ONE IP and not the two APIs (invisible to them). How can I do?
- For now, to access MySQL, they use "phpMyAdmin" I like to know if there is something else that allows for MySQL Cluster? If possible with phpMyAdmin, do you know how?
- When my two DATA nodes is down, when I write on the other, it does not update when the UP DOWN returns. Is this normal? Can we do something about it?

Well, I hope you could help me, and I apologize for my English.

Best Regards,
Original.