| 
 | 
TCP/IP is a set of communications protocols for both connection-oriented and connection-less communications that are independent of the underlying network hardware technology.
SCO TCP/IP protocols
| Protocol | Description | 
| TCP | Transmission Control Protocol | 
| UDP | User Datagram Protocol | 
| IP | Internet Protocol | 
| ARP | Address Resolution Protocol | 
| ICMP | Internet Control Message Protocol | 
| RIP | Routing Information Protocol | 
| PPP | Point to Point Protocol | 
| SLIP | Serial Line IP STREAMS module | 
| SMTP | Simple Mail Transfer Protocol | 
| Loopback | Loopback and test STREAMS module | 
| BIND | Berkeley Internet Domain name service | 
Applications developed with the SCO OpenServer Development System use either TLI, XTI, or sockets to communicate over TCP/IP.