A surgical stapling and severing instrument enables minimally invasive surgical procedures by having upper and lower jaws that are positioned with an elongate shaft and handle through surgical openings, and in particular through a cannula of a trocar. A first router directs all connection requests to one or more secure web servers, which may utilize a load balancer to efficiently distribute the session connection load among a high number of authorized client users. The axle assembly includes an axle to which the two wheel portions are rotatably mounted in spaced disposition and including a pin, wherein the pin of each castor is received in a respective socket or sleeve which extends at least in part between the two wheel portions.