I would recommend either a) having a general purpose questions thread or b) getting a single person to answer your questions, like on steam or something. You're cluttering up the coding help board.
As for your question, use something like this:
%clientCount = clientGroup.getCount();
for(%i=0;%i<%clientCount;%i++)
{
    %client = clientGroup.getObject(%i);
    %client.bottomPrint("Your empire is currently " @ %client.empire);
}