# Synchronous and Asynchronous Actions

Some actions are synchronous and others are asynchronous.

Exchange Web Service Connector does not respond to a synchronous action until it has completed the request. The result of the action is in the response to the request.

Exchange Web Service Connector responds to an asynchronous action immediately. The request is added to a queue of actions. The response to the request contains a token. You can use this token to determine whether the request has finished, and obtain the results of the action. To do this, use the `QueueInfo` action.

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