> What I want to do is as simple as that:
> 1. display an interactive map with the ususl controls
> 2. let the user navigate to a certain point of the map chosen by the
> user by controls and mouse inclusive zoom-functions

First make a decision whether you want to use v2 or v3 of the maps API
Then see either 'Hello World'
http://code.google.com/apis/maps/documentation/javascript/v2/introduction.html#The_Hello_World_of_Google_Maps
or
http://code.google.com/apis/maps/documentation/javascript/introduction.html#HelloWorld

> 3. let the user press a defined key to confirm his choice
This kind of thing
  http://www.gorissen.info/Pierre/maps/googleMapLocationv3.php
there are many such examples
  http://www.google.com/search?q=google+maps+api+get+coordinates+at+click
If you don't want to placea marker at the click you just have to alter
the code.

> 4. the map create a dat file containig longgitude and lattitude of the
> map-position the user clicked on last befor hitting the confirm key

The client-side map can't create any files.
You could submit the coordinates to some server-side code of your own
to do what you wish with it.

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