What is SSH - the protocol? What is ssh - the unix utility and how does it work? How is SSH protocol related to SFTP? What is sshd? Does the command su use ssh or sshd?
Say, on a Solaris server, user1 logs in, switches to someother user, say sruser, using su - and then starts a process of id X. And then another user user2 logs in, switches to sruser the same way and ...