hhv & ref are confusing me

[waheeb <WAHEEB@xxxxxxxxxxxxxx>]

I am testing some MAs and when I add hhv or ref to them they give better
results but I don’t understand which date they referring to. For example
lets say today is Tuesday July 22 and the trading data for this day have
been added to metastock which date are the following formulas  referring to
and what is the value they are offering:

hhv(mov(c, 3, S) , 3)
Ref(Mov(c, 3, S) , 3)

Thanks for your help