A reservation for a system resource.

The z/OS expression (often abbreviated to ENQ) for requesting resource serialization. ENQ can be used to put a user-named entry in the system resource queue in order to prevent another program using a serially usable resource. See also DEQ.

To submit a message to a message queue. Messages are enqueued by user interfaces originating new mail messages, servers receiving mail from remote sources, and intermediate processing programs such as document converters (which also dequeue messages).

Enqueue is an HTTP downloader that makes downloading files significantly less annoying. It downloads queued files, one at a time and in order. It saves added links in a tree. When a content type of text/html is downloaded, it is parsed for links, images, frame references, and a location header. These links appear as children of the downloaded document in the tree.