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There are two main-stream archie clients, one called (naturally enough) `archie', the other `xarchie' (for X-Windows). They query the archie databases and yield a list of systems that have the requested file(s) available for anonymous FTP, without requiring an interactive session to the server. For example, to find the same information you tried with the server command `prog', you could type
% archie vine.tar.Z
Host athene.uni-paderborn.de
Location: /local/X11/more_contrib
FILE -rw-r--r-- 18854 Nov 15 1990 vine.tar.Z
Host emx.utexas.edu
Location: /pub/mnt/source/games
FILE -rw-r--r-- 12019 May 7 1988 vine.tar.Z
Host export.lcs.mit.edu
Location: /contrib
FILE -rw-r--r-- 15548 Oct 9 00:29 vine.tar.Z
Note that your system administrator may not have installed the archie clients yet; the source is available on each of the archie servers, in the directory `archie/clients'.
Using the X-windows client is much more intuitive--if it's installed, just read its man page and give it a whirl. It's essential for the networked desktop.
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