| Subject | English | Thesaurus |
| IT, abbr. | Abstract Windows Toolkit-Application Programmer Interface | AWTAPI (AWT, API, Java) |
| el., abbr. | Actuator Sensor Interface | ASI |
| softw., abbr. | Advanced Scsi Programmer's Interface | ASPI |
| IT, abbr. | Business Application Programmer's Interface | BAPI (SAP, R/3, API) |
| abbr., mil. | Electrical Interface Control Drawing | EICD (WiseSnake) |
| IT, abbr. | Family Application Programmer Interface | FAPI (DOS, VDM, API) |
| abbr., scottish | Hook Interface Kit for transport of ISO containers | HIK |
| IT, abbr. | Host Transport Service Interface | HTSI (ICC, CT-API) |
| abbr., mil., commer. | Interface Control Drawing or Document | ICD |
| IT, abbr. | Internet Server Application Programmer's Interface | ISAPI (MS, C/S, WWW, API) |
| IT, abbr. | Netscape Server Application Programmer's Interface | NSAPI (Netscape, WWW, C/S, API) |
| abbr., IT | Network Termination Interface | NTI |
| abbr., file.ext. | Programmer's Interface | PI |
| IT, abbr. | Telephony Server Application Programmer Interface | TSAPI (AT&T, Novell, API) |
| abbr., file.ext. | Text-Based User Interface | TUI (WordPerfect) |
| IT, abbr. | Text-Based User Interface | TUI (UI) |
| comp., abbr. | Text-based User Interface | TUI |
| abbr., file.ext. | Transport Device Interface | TDI |
| abbr., IT | Transport Driver Interface | TDI |
| abbr., comp., net. | Transport Layer Interface | TLI |
| IT, abbr. | Transport Level Interface | TLI (AT&T) |
| abbr., comp., net. | Transport Level Interface | TLI |
| abbr., file.ext. | Universal Text Interchange/Interface | UTI |
| IT, abbr. | X/open Transport Interface | XTI (X/Open, X-Windows) |
| abbr., comp., net. | X/Open Transport Interface | XTI |