I'd love to know how they used that code in Unreal 3 ;) Especially since Unreal 1 had not long been shown off a year before the original THPS's release! Lovely backwards compatible code they must have from Unreal 1 to Unreal 3 lol! ;) Obviously never they never used Unreal, in fact I don't believe they used anything other than an in-house engine with no code name giving to it.