Scrap almost all.
Let's have 4 levels: Tasks -> Categories of applications -> Applications -> Instances of an application
There is always just one band shown on the left, showing these buttons: Esc) Go to the higher level Up/Down) Navigate between items +/-) Level dependant meaning Ok) Level dependant meaning
Instance of an applicaton Esc) Go to the Application level +) Open a new instance -) Close this instance Ok) Not available Main area is managed by this instance of the application.
Application level Esc) Go to the Categorie level Ok) Go to Instance level of the selected application +) Add an application to the list of this categorie (from?) -) Delete this application from this categorie Main area give the name+description of this application
Categorie level Esc) Go to the Task level Ok) Go to Application level of the selected categorie +) Create a new categorie for this task -) Delete this categorie from this tak Main area give the name+description of this categorie
Task level Esc) Not available Ok) Go to Category level of the selected task +) Create a new category -) Delete current category Main area give the name+description of this task.
Each left band level should have a different color.
I now believe that there should be just one notification area, to the bottom of the screen.