@Razor:
ANet Pro allows you to use unlimited clients.
Yes, all you have to do is putting the plugin in your plugin_dir (see manual) and include the anet.h file.
The manual explains all the functions that are available. For starting with ANet, best would be to download the simple 3d chat tutorial.

Yes it should also work with the 30 days trail edition (but only the ANet Free version). The free version and all the information are available on my homepage (see signature).