| CSP | Client Server Protocol |
| API | Application Programming Interface |
| DLL | Dynamic Link Library |
| ID | Identifier |
| IM | Instant Message |
| Client application | An application, which uses the IM SDK API library. Also called client. |
| ECom | A generic framework for specifying plug-in interfaces, and for calling and writing plug-ins. |
| Application ID | Unique identification of the application. e.g. MyMessagingApplicationv2.0 |
| User ID | Identifier of the user defined in the used protocol, e.g. WV user ID – wv: [email protected]. |
| Orphan message | WV message of SAP, received when there is no application to handle that message |