Software used to generate a file.

Method used for the compression of a file.

Code to identify a network like ethernet, token ring, etc. implemented in a computer environment.

Code to identify an application software, like autocad, winword, etc. used in a computer environment.

Code to identify the type of hardware installed in a computer environment e.g. pc, mac, unix-workstation, mini, mainframe.

Software used for the compression of a file.

Code to identify the operating system, like dos, vms, etc. used in a computer environment.

Code to identify the system, which acts as a sending system in an interchange.