Several RMI (easy) issues

Hi,
Developping a small RMI application, I face the following issues:
I can run several RMI servers on a machine (launched with 1 or more userId (root, guest, foo)) but how can RMI clients be notified of how many RMI servers have been launched (and their port number). How to specify the server we want to log in ? Is it possible to have from a client the list of all RMI servers running on a machine ?
I would like that clients use login/passwd to connect the RMI server. In fact, If the client authentifies itself with root/passroot it automatically runs on the root RMI server launched. How can I do that ?
Thanks.
If it is not clear enought I will explain my problems differently.

Here are my replies:
1) the issue is that the server can execute system commands (kill ,renice, performance command...). So, I don't want, if a server has been started as root, that every body accessing this server can run a kill on a process. So every user would have to launch its own server and then only access to services it can perform normally when logging on this machine. Moreover the RMI server has to retrieve a lot of infomation in less than 1sec (do some sys calls and internally retrive the state of all processes running on the server machine) so I think is better do launch several servers.
Note: the client MUST have a direct access to the server machine. It is a pre-requiered.
2) Thanks.
3) So the client can send the login/passwd info tho the server, which look in the unix account on the system, register the client with the good server and that accept the connection.
A lot of messages talking aboiut RMI security gives some idea on how implmenting a secured connection between client/server but I cannot find any pseudo-code or code sample.
Do you have sme pointers ?
Thanks

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