1) MetaStock -> Tools -> Expert Advisor -> New -> Highlights -> New -> Color Green:
Cross(C,Ref(Mov(C,5,S),-1))
2) Ok -> New -> Color Red:
Cross(Ref(Mov(C,5,S),-1),C)
3) Ok -> Ok -> Attach -> Close.
4) Observe Green and Red coloured bars indicating original conditions.
Not bad for a...