Does af:commandButton submit multiple requests at the same time?

Hi experts,
I have a question about af:commandButton behavior.
I have two commandButtons in a page. They are button1 and button2.
Button1 takes a few seconds to complete its request process.
So when I click button1, I can click button2 although button1 request is still being processed.
I checked how ADF faces handled this situation with servlet filter.
And I saw that button2 request was always submitted after button1 request was completed.
Due to this behavior, I would assume that commandButton is designed not to submit multiple requests at the same time and guarantees click order.
However I couldn't found any documents specifying this feature of commandButton.
If anyone knows it, could you share?
I know ADF Faces has busyStateListener to prevent user inputs during request round trip.
But I'd like to make it sure that I don't need to use busyStateListener if I just want to keep processing order.
Regards,
Atsushi

Hi,
Does anyone know the document specifying the behavior of af:commandButton in case I click two buttons in a page almost simultaneously?
Any help will be much appreciated.
Thanks in advance,
Atsushi

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