A gutta-percha point, used as a root canal plugging material in an endodontic treatment, is disclosed. According to one embodiment of the invention a method is provided for performing tunnelling wherein, a first packet is received having a stored first checksum value covering at least portions of the first packet, and wherein the first packet is encapsulated by providing a header to the first packet. The third entity is coupled to a table caching fingerprints of first data structures of the first data structure type and second data structures of the second data structure type associated therewith.