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Then, if a car Has both AT and MT, then how does the change of gears influence the motion of the clutch disc? Someone told me that in an example of the BMW 545, how does one, go about moving from one transmssion to another? I hope I'm clear

seamless procedure. just move the shifter into drive for auto, or over to manual, for up/down shifts.

I guess you're talking about the maula overide in auto mode, this is just down to some smart electronics in a tiptronic box

There is only one transmission in the car,you are simply changing tha auto trans manually insted of letting it shift automatically.It has a shifter with a dual gate pattern, the auto shift is when in drive, then in other gate you shift it up and down without any pedals just like downshifting or upshifting any auto trans.

I don't think they made a dual transmission for an automotbile in the US still. The only ones I have seen is abroad. IF you're referring to like manual shift like they have in some cars like Audi, BMW and some American cars, they're an auto transmission because if there's one side of the shifter that has like a H or L or + or , then I know what you're talking about. This makes the car either go into a higher or lower gear when you're cruising on the freeway, put it on + it'll shift into a higher gear or to go into a lower gear, but if you put into D "drive gear" it'll shift automatically. But this choice is on luxury model and sports cars. it's a nice way to intigrate a manual like feeling when you're in a auto car.