| English | Thesaurus |
| Application Control Architecture Services | ACAS (DEC) |
| application program | A program that processes business data through activities such as data entry, update or query (Contrasts with systems programs, such as an operating system or network control program, and with utility programs such as copy or sort) |
| Application Program Interface | API (API) |
| Application Program to Program Converter | APPC (IBM) |
| Application Program to Transaction Manager | APTM (TP) |
| Application Transaction Program | ATP (IBM, APPC) |
| Biometric Application Program Interface | BAPI (API, MS) |
| Common Speller Application Program Interface | CSAPI (API) |
| Communication Application Program Interface | CAPI (ISDN, API) |
| eXtended Messaging Application Program Interface | XMAPI (API) |
| Human Authentication Application Program Interface | HAAPI (API) |
| Human Authentication Application Program Interface | HA-API (API) |
| Licensed Services Application Program Interface | LSAPI (MS, API) |
| Lightweight Directory Access Protocol Application Program Interface | LDAPAPI (LDAP, RFC 1823, API) |
| Lightweight Directory Access Protocol Application Program Interface | LDAP API (LDAP, RFC 1823, API) |
| Messaging Application Program Interface | MAPI (MS, WOSA, API) |
| Network Application Services | NAS (DEC) |
| Queue Application Program Interface | QAPI (SAP, API) |
| Special Interest Group for CD-ROM Applications Technology | SIGCAT (CD) |
| Special Interest Group for Cd-rom Applications Technology | SIGCAT |
| Switched Digital Services Applications Forum | SDSAF (organization) |
| TALigent Application Program | TALAE (Taligent) |
| Telephony Application Program Interface | TAPI (Intel, MS, WOSA, CTI) |
| Telephony Services Application Program Interface | TSAPI (AT&T - Novell) |
| Voyetra Applications Program Interface | VAPI (API) |
| Web Services for Interactive Applications | WSIA (OASIS, WWW) |
