ah, all he says is " This script has a role hiding a complexity about server/client model and executes server on demand automatically by using fork(2) and setsid(2) in UNIX-like systems. So there is no need to care about server/client model for users." and "bin/rsense is wrapper frontend script which provides us a way to operate RSense transparency in server/client model. When bin/rsense is executed, bin/rsense tries to execute a daemon server if it doesn't live by forking and executing primitive frontend. In a time after forking, it will create an unix domain socket to communicates with a frontend. After executing the daemon, bin/rsense tries to open the unix domain socket and sends a given command from a terminal."