not exactly sure what you mean but i think they mean go to the web site.
then right click a link to "open in a new window"
and then in theory opening two windows booking two res. at almos the same time.
entering the info on the first, while the second is loading up speeding up the time?
not really sure that will save you alot anyhow.
but that's my guess.
Either way,my thought is, it's not getting your ADR's the might be tough but getting through.
after all it doesn't matter if 3 months of people are trying to make
ADRS tomorrow, the same number of people are trying to make ADR's for the week whenever your trying to get them like it would be any other time.
the only overload will be the number of people trying to get through that day.
Plus I think this is example of over obsessing paranoia then a real problem.
ADR's shouldn't make or break your trip. you still have plenty of chances to make them if you want, between now and then, that week, or day of or just walking up and asking for a table when they open. people here make getting ADR's sound more important than your room.
relax, try making some adr's and remember you can't do everthing when you go there anyhow, and that includes eating everywhere. plus the more time you eat the less you have for the parks.