What's the difference between "Warhammer Fantasy Roleplay" (no edition mentioned) and "Warhammer Fantasy Roleplay 2nd Edition"? And I see something on here that indicates a 3rd edition. Is the one with no edition mentioned the 1st edition (same rules as the old Games Workshop rules, but re-printed with new art?), or is that the 3rd edition?
What system are they using? The same system as the old GW rules? refined version of the GW rules? Something new? some other game company's system (d20, GURPS, d6, BasicRPG, Hero, HARP, etc.)?
And what about the two WH40k RPGs (Rogue Trader and Dark Heresy) ... are they the same system as WHFRP 1st edition? 2nd edition? 3rd edition? something different? Are RT and DH compatible with each other?