| ATP | Appletalk Transaction Protocol [engl.] |
| ATFP | AppleTalk Filing Protocol [engl.] Firmenstandard |
| ATCP | AppleTalk Control Protocol [engl.] Firmenbezeichnung |
| AFP | AppleTalk File Protocol [engl.] Firmenspezifischer Dateistandard |
| AEP | AppleTalk Echo Protocol [engl.] |
| ADSP | AppleTalk Data Stream Protocol [engl.] Informatikbegriff, symmetrisches, verbindungsorientiertes Protokoll in einem AppleTalk-Netz, über das zwei Rechner eine virtuelle Datenverbindung aufbauen und über diese in beiden Richtungen kommunizieren können |
| AARP | AppleTalk Address Resolution Protocol [engl.] Firmen-Entwicklung |
| ARAP | AppleTalk Remote Access Protocol [engl.] Firmenbezeichnung [Apple] |
| AURP | AppleTalk Updated Routing Protocol [engl.] Firmenbezeichnung |
| BTP | Business Transaction Protocol [engl.] |
| BTP | Business Transaction Protocol [engl.] |
| VMTP | Versatile Message Transaction Protocol [Internet] |
| CAP | Columbia AppleTalk Package |
| UAB | UNIX Appletalk Bridge |
| ARNS | AppleTalk Remote Network Server [engl.] Firmenbezeichnung |
| TP | Transaction Processing |
| TM | Transaction Monitor |
| TI | Transaction Identifier |
| ITM | Internet Transaction Mix |
| JTA | Java Transaction API |
| TTS | Transaction Tracking System |
| STT | Secure Transaction Technology |
| IST | Internet Transaction Server |
| TPS | Transaction Processing System |
| TPM | Transaction Processing Monitor |
| JTS | Java Transaction Service |
| SET | Secure Electronic Transaction |
| MTS | Microsoft Transaction Server |
| OLTP | On Line Transaction Processing |
| FINTS | Financial Transaction Services |
| DTC | Distributed Transaction Coordinator |
| DTP | Distributed Transaction Processing |
| ATP | Application Transaction Program [engl.] |
| OSTM | Open System Transaction Management |
| DDTA | Digital Distributed Transaction Architecture |
| TCAP | Transaction Capability Application Part |
| BOT | Begin Of Tape/Table/Transaction |
| PTAL | Payment Transaction Application Layer |
| TPC | Transaction Processing performance Council |
| TPC | Transaction Processing / Performance Council |
| ITRS | International transaction reporting system Meldesystem für Auslandstransaktionen |
| UCITA | Uniform Computer Information Transaction Act |
| TPSE | Transaction Processing Service Element |
| APSI | Attribute Phase Split Transaction [engl.] |
| EOT | End of Tape/Transaction/Transmission/Table/Text |
| MAPTOP | "Manufacturing Automation Protocol/Technical Office Protocol, ""MAP/TOP""" |
| IPSEC | Internet Protocol Security Protocol |
| IPCP | Internet Protocol Control Protocol |
| PEP | Protocol Extension Protocol |
| TCP/IP | Transmission Control Protocol / Internet Protocol [Internet] |