6. RCD and RMT: Remote CD-ROMs and Tapes
8. RLOGIN: Logging In to a Remote Host
9. RSH: Issuing Commands on a Remote Host
10. Sending and Receiving Electronic Mail
11. TALK: Exchanging Terminal Messages
12. TELNET: Connecting to Remote Terminals
13. TFTP: Trivial File Transfers
14. WHOIS: Username Directory Services
15. Accessing Remote Systems with the Secure Shell (SSH) Utilities