There's no specific support (yet), so I'll just list some ways to do so:
- NFS or Samba file sharing (would require the clients to get an extension somehow, maybe remastered or from the net)
- an FTP server (ftp client is a part of the base, the server is an extension)
- TFTP (both client and server available in the base)
It's also possible to run your own TC repo, and configure your clients to use that, so appbrowser downloads from your network.
If you have any ideas for a better way, or light enough to implement in the base, feel free to present them