Server guests auto download (?)

Is there a way to force an auto-download feature to guests from what the admin has installed?

I would assume it possible on a dedicated, but I’m not sure. Possible on a listen server at all?

Also, if it is possible, does it auto-install? Even if its only applicable to addon folder addons - I would like to know if any of this is possible.

Needed files are downloaded from the host when the client joins, as long as the addon has the resources set up correctly. These files are only for this host: they do not install to the client’s gmod directory, so if that client were to start singleplayer, they won’t have what they downloaded from you.