Bruno,
When you type amigaforum:arc with no other parameters, ARC will give
you the list you spoke of (it's a quickie how to use list). When you just type
arc and it tells you that it's an unknown command, that's because whereever you
have ARC is not in the search path for the OS. If you had typed
amigaforum:arc x aterm
it would have loaded arc and then looked for aterm on that disk. Since you
only have 1 diskdrive, you'll have to type this:
amigaforum:arc x <diskname>:aterm
OR you can move ARC into your c directory on the workbench disk and then when
you type arc x aterm (presuming aterm is on your current disk in the current
directory) it will work.
Don