By default, the CTIOS Agent Desktops use a feature of the CILs to load balance between CTIOS Server A and B as specified in the registry by the CTIOS Desktop install.
Some customers have asked for the feature of being able to select a preferred CTIOS Server Side (for instance if Side A is local and Side B is remote; it would be preferable to have Side A as the preferred side.
In order to accomplish this you would need to create a custom CTIOS Desktop using the CTIOS toolkit.
You would replace the CTIOS Agent State control for Login with a custom login button. In the connect method, provide both Host A and Host B IP address of the preferred server. In case of an error, in the try catch block, try the other server's IP address.
It does defeat the purpose of load balancing between the servers but you can either have load balancing or a preferred server but not both.