Currentely they are doing the remaining C212 of 10^227-1 but i've understood there's plenty of room for larger composites when more people help with the sieving.
There isn't really a problem when the client window is not vissible, you only have to be careful when you stop the client. When i want to stop the client, i always make the window vissible, press the stop button and wait until the window disappears.
BTW, after Ernst wrote the original message, RSA 160 was cracked!
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