garch model, variance forecast, static or dynamic?

[maxchen]

In EViews, there are choices of static and dynamic, what is the difference?
cause the conditional variance is not observable, what is static forecast then?

[maxchen]

I figure it out

for dynamic
h(t+n|t) = E[h(t+n)|I(t)] n=1,2,3,.....
where I(t) is information set

for static, rolling one step, say
h(t+1|t) = E[h(t+1)|I(t)] t= T+1, T+2, .....