The following abbreviations are used in the Microsoft® SNA Server SDK documentation.
| Abbreviation | Description |
|---|---|
| ACKRQD | acknowledgment required |
| API | application programming interface |
| APPC | Advanced Program-to-Program Communications |
| ASCII | American Standard Code for Information Interchange |
| BBI | begin bracket indicator |
| BBIUI | begin basic information unit indicator |
| BCI | begin chain indicator |
| BETB | between-brackets |
| BICB | bind information control block |
| CCITT | Comité Consultatif Internationale de Télégraphie et Téléphonie |
| CDI | change direction indicator |
| CEI | chain ending indicator |
| CICB | connection information control block |
| CPI-C | Common Programming Interface for Communications |
| CRC | cyclical redundancy check |
| CSV | common service verb |
| CTS | clear to send |
| DAF | destination address field |
| DFC | data flow control |
| DFT | distributed function terminal |
| DLC | data link control |
| DLL | dynamic-link library |
| DMA | direct memory access |
| DMOD | dynamic access module |
| DR1I | definite response 1 indicator |
| DR2I | definite response 2 indicator |
| DTE | data terminal equipment |
| DTR | data terminal ready |
| EBCDIC | Extended Binary Coded Decimal Interchange Code |
| EBI | end bracket indicator |
| EBIUI | end basic information unit indicator |
| ECI | end chain indicator |
| EDI | enciphered data indicator |
| ERI | exception response indicator |
| EXR | exception request |
| FMD | function management data |
| FMHI | function management header indicator |
| FMI | Function Management Interface |
| GDS | general data stream |
| HDLC | High-Level Data Link Control |
| IHV | independent hardware vendor |
| INB | in-brackets |
| IRP | I/O request packet |
| K | kilobyte |
| LAN | local area network |
| LL | record length |
| LPI | locality, partner, index |
| LU | logical unit |
| LUA | conventional Logical Unit Application programming interface |
| MAC | media access control |
| MB | megabyte |
| MDI | multiple document interface |
| NAP | Network Access Program |
| NAU | network addressable unit |
| NC | network control |
| NCP | Network Control Panel |
| NSPE | network services procedure error |
| NMVT | Network Management Vector Transport |
| OAF | originating address field |
| OEM | original equipment manufacturer |
| OS | operating system |
| PC | personal computer |
| PDI | padded data indicator |
| PIP | program initialization parameter |
| PLU | primary logical unit |
| PU | physical unit |
| PVC | permanent virtual circuit |
| QLLC | qualified logical link control |
| QRI | queued response indicator |
| RH | request/response header |
| RNR | receive not ready |
| RTI | response-type-indicator |
| RTM | Response Time Monitor |
| RTS | request to send |
| RU | request/response unit |
| RUI | Request Unit Interface |
| SAA | Systems Application Architecture |
| SAP | service access point |
| SC | session control |
| SCM | Service Control Manager |
| SDI | sense-data-included indicator (in LUA) system detected error indicator (in EIS) |
| SDLC | Synchronous Data Link Control |
| SLI | Session Level Interface |
| SNA | Systems Network Architecture |
| SNADIS | SNA Device Interface Specification |
| SNRM | set normal response mode |
| SRL | Setup Resource Library |
| SSCP | system services control point |
| STSN | set and test sequence number |
| SVC | switched virtual circuit |
| TH | transmission header |
| TP | transaction program |
| TS | transmission service |
| TSR | terminate-and-stay-resident |
| UA | unnumbered acknowledgement |
| VCB | verb control block |
| VTAM | Virtual Telecommunications Access Method |
| XID | exchange identification |