application session

A communication channel between two endpoints of a peer-to-peer application, which is established using the location information that Communicator instances provide by running at the two endpoints.

application sharing

Displaying an application on one conference participant's desktop so that it is visible to all conference participants.


Microsoft® Office Communicator 2007, a desktop client to Microsoft Office Communications Server 2007, providing contact and presence management, instant messaging, as well as telephony integration in real-time communication within an enterprise.

Communicator application

An application that uses Office Communicator Automation API to provide some or all of the Office Communicator 2007 functionality.

Communicator client

See Communicator application.

communications service

The server through which Communicator connects to other users.


1. A Communicator IM, voice, or video session that is controlled by an Office Communications Server.

2. A voice or video session that is controlled by a conferencing service.


A user listed in the Contacts list of another user.

contact group

See group.

Contacts list

A list of individual contact users persisted on and maintained by an Office Communicator server on behalf of a local user.


A peer-to-peer Communicator IM session. See also conference.

enhanced presence

The official term for rich presence — the publication of customized presence information to presence subscribers.

federated contact

A contact that is part of a different organization.

friendly name

A name that appears in displays, such as the Contacts list, instead of the user's e-mail or SIP (Session Initiation Protocol) address.


A named collection of contacts in the Contacts list.

Local client

A local workstation application acting as a client to the Office Communicator server. The client can be the Office Communicator UI or a custom application written to implement Office Communicator Automation API.

Local user

An enterprise user registered with a Communications Server. The local user uses the Local client to sign in to the Communications server and interact with other users.


To disable the keypad on a mobile device so that keys are not accidentally pressed, for example, when the device is stored in a pocket or purse.


In the API, a Messenger object implements the IMessenger Interface (or IMessenger2 Interface or IMessenger3 Interface) interface and serves as a proxy to Communicator.

Office Communicator Automation API

Office Communicator Automation API uses the COM-based technology Automation. It provides programmatic access to a local Communicator instance as well as the underlying communications service.


Not connected to the instant messaging system. A user who is offline might still be able to receive calls or e-mail.


Connected to the instant messaging system.


The ability to detect the availability of other users in a communications system. See also presence status.

presence status

The availability of a user in a communications system, for example, Online, Offline, Away, or Do Not Disturb.

rich presence

See enhanced presence.


To request that the Communicator server add a user in the local user's contacts list.


To request an alert for a specific contact when that contact's presence status changes.

tagged contact

A contact whose presence status is displayed in an alert whenever the contact goes offline or online.


An enterprise user registered with a Communications Server.

See Also