When you want to suspend an rlogin connection so you can return to it later, type the tilde character (~) followed by Ctrl-Z. The rlogin connection becomes a stopped process and you are placed back at the machine from which you logged in.
To reactivate the connection, type fg. Alternatively, you can type the percentage sign (%) followed by the process number of the stopped process (the default for %, if no process number is included, is the process most recently suspended).
Similar to aborting rlogin with ~~., typing two tildes and Ctrl-Z suspends the current rlogin and places you at an intermediate rlogin.