<command> vs <application>

I am a bit confused about these tags. At first I had assumed that <application> was for referring to a program as a proper noun and <command> was for instructions that one might execute. For example: <para> <application>links</application> is an unusual web browser in that, unlike graphical browsers such as <application>Firefox</application>, it is run from the command-line with an instruction like <command>links http://fedora.redhat.com</command>;. </para> However, upon closer inspection of the docbook docs, <command> seems to be meant for any reference a CLI command, whereas <application> is meant for any GUI application. So the "correct" markup for the above would be: <para> <command>links</command> is an unusual web browser in that, unlike graphical browsers such as <application>Firefox</application>, it is run from the command-line with an instruction like <command>links http://fedora.redhat.com</command>;. </para> I can understand why we might want to differentiate between commands the user might run and commands that are just being mentioned (my initial assumption), but the official definition, which requires a different tag for links and Firefox when mentioned in the same context, seems arbitrary and kind of silly. Can someone please shed some light on what the rationale is here? Thanks, --Brad --