What is the .screenrc file for?

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http://unix.stackexchange.com – Just a question for the experts that I know will help me. ;) What is the .screenrc file for? I have seen it in some dotfiles repos and such but I don't quite understand what it's for. Judging from the name it sets settings for the Terminal itself, not the shell, am I correct on this? I suppose not, in that case, what is it actually for? And does it change from shell to shell? Thanks for your help! - Eduan (HowTos)