REPL Start a REPL with Lem packages available Start a REPL with another Lisp core Start a REPL from the terminal with lem --eval Connect to a running Lisp server (Micros) REPL commands Configuration Compilation Call the form at point: lisp-call-defun C-c C-y Evaluation Evaluation prompt Inspection Interactive debugger Code navigation (find-definitions, lisp-search-symbol) Trace Watch Macrostep, macroexpand Sync packages Remove unused imports Code search Apropos HyperSpec lookup Editing Paredit mode Colourful parentheses Testing Using micro with test-runner APPENDIX: Lem features not found in Emacs and Slime Lem is written and extensible in Common Lisp.