Quote: "I have two entities, and I would like to make them speak with the player, both at the same time... and it's look impossible!
Is there any way? "
That is very possible.
You can have 5 or 6 or more at the same time if you want.
Just make sure that they have unique names (not named alike) and that that are not positioned over each other (hudx= hudy=).
If you use the hudshow= and hudunshow= then the HUD will stay up as long as you want (including while other HUDs are being displayed).
:state=1,plrwithinzone=1:hudshow=obj1message1,hudshow=obj2message1,state=2
:state=2,plrwithinzone=0:hudunshow=obj1message1,hudunshow=obj2message1,state=3
Of course you would also need to create the HUDs in state=0, but this will give you an idea of how to show multiple HUDs at the same time.