DosCloseQueue ends further processing of a queue by the requesting process. The action taken depends on whether the requester is the owner of the queue or a writer of the queue.

For the owner, any outstanding elements are deleted. Other processes that have the queue open will receive the ERROR_QUE_INVALID_HANDLE return code on their next request.

For a writer of the queue, access to the queue is ended, but the queue elements are not deleted.