(quality of service) (n.) The performance limits you set for a server instance or virtual server. For example, if you are an ISP, you might want to charge different fees for virtual servers depending on how much bandwidth is provided. You can limit the amount of bandwidth and the number of connections.
(n.) A component of an HTTP request URL that contains a set of parameters and values that affect the handling of the request.
(n.) In the Java Message Service, an object created by an administrator to implement the point-to-point delivery model. A queue is always available to hold messages even when the client that consumes its messages is inactive. A queue is used as an intermediary holding place between producers and consumers. See JMS, point-to-point delivery model.