Do you run items in CL that return to an emacs buffer? Like say, slime-eval/run? Or are these just run in the repl itself and displayed there? Been toying with

Do you run items in CL that return to an emacs buffer? Like say, slime-eval/run? Or are these just run in the repl itself and displayed there? Been toying with making some async stuff run via swank/slime and then display in emacs in a custom mode and buffer.