No version info available is just a warning; as you can see, it does searches for the hash regardless.

The miner only searches for the one pattern displayed (it choses the one it thinks being most profitable based on reward divided by difficulty).

You can use as many computers with the same credit address as you want; if one of them finds a solution it will submit it with that address. The computations are done "offline" with no shares sent to the upstream server, so it doesn't really knows how many miners are there until one of them finds a solution. (Well, technically they still request a list of available bounties from the server every once in a while, but it gives no indication to the pool of the speed and capacity of each client).