[log_n]

Heh it's options writers or buyers (just options market makers in general). A lot of stuff is electronically traded but there are still some very large orders with huge deltas that are put up on telephone calls.

And yeah it makes sense to have an extra prompt pop up if it's an order over X contracts or Y ticks from the market. And I've seen a lot of systems set up like that.

A lot of times traders will just punch the "OK" box and do their trade though.

That's of course if traders are manually hedging their portfolio/trade. A lot of times they just set their portfolio to auto-hedge based on certain parameters (ie at Z deltas or we've moved C ticks in a time period).