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I think this question applies to real RiscPC machines as much as it does to VirtualRPC-SE (But I do not know where else to ask).
I have 3 RiscPC machines (two real and one virtual) connected to a local area network here home; and 1 (real) RiscPC at the other end of a VPN connection at a remote site.
All four of the machines can communicate to each other using TCP/IP over the LAN at each site and the VPN connecting both sites. Protocols which work include HTTP (including SocketFS), FTP, VNC, Telnet, etc. All from any one machine to any other (and all at the same time etc). Magic - so far.
But file sharing (Access, Access+, NFS, LAN Manager, Omniclient, etc) only works on the 3 local machines (real and virtual) - I get no 'discs' visible across the VPN - no ports are blocked with my ISP.
Am I doing something wrong?
Do I need some additional software?

Possibly the Firewall between the local and remote sites is blocking the port used by ShareFS. You will need to check to see what other traffic works over the VPN.

NFS works all the time between Solaris machines and I have had Printer sharing working between two windows machines.
But thanks anyway.
Is ShareFS fully TCP/IP compatible? i.e not NETBEIU or similar?
and if so what ports are used?

ShareFS uses TCP/IP (as far as I know). You will need to ask RISCOS Ltd what port(s) it uses as I don't know.
Although you ought to be able to probe the system. ShareFS broadcasts all the time - so with a VRPC running you might be able to monitor what's happening locally.

OK, Thanks,
I will chase that idea.