A method for operating a computer network to preload the content of web addresses on the local memory. The network comprises at least one device, a web cache memory, and internet access apparatus to connect a device on the network to internet using a web browser, relevant devices on the network being accessible to a network administrator and defined network users, a method whereby one of the defined network users uses a modified web browser to define a set of web addresses to be accessed, the set of web addresses being stored in the network, and operates the network to cause the content of the set of web addresses to be stored on the web cache memory. Limits or quotas may be set up for the amount of memory space usable by each user and users may be limited to access web pages defined by one or more preload tasks.