Overrev. a TipTronic ?

[williamsF1]

My 98' Boxster is my TipTronic / Autmatic car.

I read a lot about people suggesting not to over-revving the car.

I was wondering what I can do to prevent doing this in my Tip Boxster.

Usually when I accelerate and I want to make a fast acceleration, I just floor the speeder and the rev meter goes into the red zone for a very short while in each gear (Automatic mode - D). Is this actually harmful to the car (I do it a few times a week), it would seem strange if the car was not designed to handle maximum acceleration a few times a week, and even more strange if the TipTronic was not designed in a way that prevented damaging your car?

The rev-needle does not stay in the red area of course it just goes there and then shifts.

Even if I am in TipTronic mode the car will make a shift automatically if I 'forget' to shift, could this cause overreving ?