Do you find it difficult messing about with PPP commands trying to set up a link between your RiscOS box and say a PC? Well PPPServ could be the answer! You connect the machines with a null modem cable and then run PPPServ. The other machine now sees you as a modem and will try to "dial out". When your machine "answers", a PPP connection is set up automatically.
NEW: Now works with wvdial under linux! Also no longer disconnects when the link goes idle for a while.
You can find detailed instructions on connecting to a PC with PPPServ on Matthew Lee's website.