Hi Peggy

Yes, you need to install it on your main PC because this will be the cow manager, I'm not sure it will count for one cow, maybe not if you don't use the cow.

Autoscan: I don't use it, seems to act strangely.

What I do is this: check every ip address  of the network computers, and enter manually the ip address in the Hypervue manager, it then finds the cows instantly.

Having a slow cow will only affect the frame/tile that is rendered by this cow. All cow management is done by the main computer, which needs to be the most efficient.

Rendefring will use 100% of your cpu power, but in my case, I can surf the net, or even use Photoshop while rendering, and I don't have the most powerful machines.