No it doesn't. It explains what the three as a group do; what I'm asking is, what's the difference between these three? Why did we need three separate commands? When (in the pre-SSH days) would you use one versus the others?
I'd assume rexec runs a command on a remote host non interactively; rsh runs an interactive shell on a remote host; and rlogin allows you to interact with login(1), again on a remote host. But I've not read the man pages as I'm on my phone.
slogin is just a symlink to ssh, and sexec does not exist. So the s-commands' manpages tell me nothing about the difference between rsh, rlogin, and rexec, or why all three needed to be created.