Thank you Ned, I understood well. But what was confusing me is that when 
I create a Morph like said in all the tutorials I've found, Squeak 
actually creates in inside a window, inside the Squeak world. 
Fortunately, Bert Freudenberg provided me an example of code that makes 
things quite clear.

stF


Ned Konz wrote:

>On Wednesday 20 November 2002 12:51 am, Stefan Champailler wrote:
>  
>
>>Following some tutorial, I made a class derviving from Morph. Then
>>I instanciate that class (Ant) like this : Ant new openInWorld.
>>This works fine : I have a morph in a window (well that's what I'm
>>think).
>>    
>>
>
>Perhaps what's confusing you is that Squeak itself runs in a single 
>*operating system* window. Ignore that: maximize the window, or click 
>the "Escape Browser" button from the Navigator flap at the bottom.
>
>When you do openInWorld, your new Morph will be displayed in the 
>Squeak world, which is inside the single Squeak operating system 
>window.
>
>Right now, it's not particularly easy to make another operating system 
>window.
>
>Within the single Squeak *operating system* window, there can be 
>*Squeak* windows like browsers, etc., but these aren't required.
>
>  
>