A method in a radio communications network is described of using image data for positioning a first wireless device. The methods and apparatuses disclosed herein are concerned with formation of appropriate flowable materials, control over the manner in which the flowable materials are applied, treatment of the components prior to application of the flowable materials and the like. The ability of embodiments to provide the sharing of documents and the storing can enable an efficient searching for a shared document. Channel usage information within the client links is recorded to indicate current channel usage and this information is updated by the trail manager whenever a trial using a channel is added or deleted.