| API | Application Programming Interface |
| DB | Data Base |
| DLL | Dynamic Link Library |
| ID | Identifier |
| IM | Instant Message |
| IMPS | Instant Messaging and Presence Services |
| GPRS | General Packet Radio Service |
| MIME | Multipurpose Internet Mail Extension |
| PToP | Point-To-Point |
| WV | Wireless Village |
| CSP | Client Server Protocol |
| Client application | An application, which uses the IM SDK API library, shortly client. |
| Contact | Contact item from the Contacts Model. |
| ECom | A generic framework for specifying plug-in interfaces, and for calling and writing plug-ins. |
| Point-To-Point Message | Instant message sent between two users. |
| User ID | Identifier of the user defined in the used protocol, e.g. WV user ID – wv: [email protected]. |
| Application ID | Unique identification of the application. e.g. MyMessagingApplicationv2.0 |