This is the (back-end) client software managed by FAHControl and typically runs behind the scene. This is a truely unified client (slot) manager. FAHClient starts one or multiple instances of a Fahcore and manages the work assignments for each of these client "slots."
Here are the main goals of the new Folding@home client:
To make the installation and startup user-friendly for the Novice.
To integrate the user interface into a single Monitor/Control? program that manages the functionality previously contained in separate clients.
To create a forward-looking design that can be readily expanded to incorporate new FahCores without the need to issue new client releases.
To greatly improve previously problematic aspects including support for SMP, GPU, and the 3D viewer.