Abstract: A form of hyperlink is provided comprising a first component identifying a network entity and a scheme by which to communicate with that entity, and a second component comprising a further scheme and further address by means of which to access a resource relative to the network entity identified by the first component. Such hyperlinks support simple and fast sharing of files and, in some cases, support tunnelling through firewalls to achieve this. The invention also provides related data representations, electronic documents, protocols, signals, methods, devices, systems and other apparatus, and programs for computers.

Abstract: Detection of items stored in a computer system such as computer code, data or information includes obtaining signatures characteristic of programs of interest such as steganographic programs. A signature is obtained by reading code from a program of interest. The code may consist of the first 500 bytes from a .DLL file taken from the programs' core steganographic kernel. This code is then the signature. The computer system compares the signature with files it holds, other than files on a prearranged exclusion list. If a signature is found to match data in a file, the filename, the finding of steganography in it, the file location and the matched signature are recorded by the computer system for output to its user.