SSH Silent Exit?

How do I exit out of putty so that when running an application it doesn't turn off with it... besides screen...

I'm running a counter-strike server, and when I add & at the end which allows me to than hit ctrl + z without it turning off. So now i'm back at bash and I can do more commands (servers still running at this point) and than when I exit out of putty the counter-strike server closes... sorry if i'm confusing you

 

 

 

 

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