runCommand -package:wai-app-static -package:libmpd -package:structured-cli -package:beam-migrate package:xmonad-contrib -is:exact

Given a list of command/action pairs, prompt the user to choose a command using dmenu and return the corresponding action.
Given the name of a command from defaultCommands, return the corresponding action (or the null action if the command is not found).
Given a list of command/action pairs, prompt the user to choose a command using dmenu-compatible launcher and return the corresponding action. See X.U.Dmenu for compatible launchers.