RISC OS SignalBox Simulation RISC OS
http://www.svrsig.org/

Entering your key:

After you type 'K' and press RETURN, you will be asked to type in your name, exactly as shown in the e-mail you received when you purchased the key, and your address, followed by your six digit key number. When you press RETURN, the key should be recognised as correct - Next step

step 3