A web page, including clickthroughs, is cached at a location within a network intermediate a client requesting the page and the host web site for the page. The joining process may include, for example, placing at least first and second joining areas in proximity to one another in a cavity, forming a plasma in the cavity by subjecting a gas to electromagnetic radiation in the presence of a plasma catalyst, and sustaining the plasma at least until the first and second joining areas are joined. Images of sample volumes are obtained by moving an imaging device from a first position to a second position across the one or more sample volumes.