How to create connection to cluster of Oracle database server?

Hi, all!
I have to create connection to Oracle cluster. How to do that?
I can make a connection to one server but to cluster ....
I saw many documents but without any result.

Hello
Two servers with oracle database server installed organized as a cluster.
Both server work in parallel, when one of them stop work the other takes connection automaticaly.
The connection to the cluster is not usual as a one server.
I have to specify both servers.Any time i can make a connection to one of them but when he stop work my connection will be broken.
Because of that the servers work under oracle server software.
So i can make a connection to one of them and both.
This is made because it is for production firm with many test computers that work 24/7 and send information to this oracle server.
So i have to make a connection to the general oracle cluster (the two servers simultaneously).
I saw some connection strings to do tha written on Visual Basic but i have no idea how to do that in C/C++.
There is no information about that in the Oracle tutorials and manuals.
I need this explanation because i make a connection without TNS config file.
Can you help me?
I will be very appreciated.

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