Class Window:
~~~~~~~~~~~~~~
Window definition with the basic chracteristics; they are switchable from
front to the background, they can be minimized, maximized moved on the
screen they are sizeable and can be arranged to tile or to cascade.

Common use:
~~~~~~~~~~~
It is primitive function of class Task, the sole simple use can be following:
LOCAL OBJECT Wi OF Window
Wi:Init(....)  //or Wi:GoodInit(...)
Wi:Paint()
...            //Wi:Drag(), Wi:Maximize(), Wi:Minimize(),...
Wi:Done()

Source code is in C_Window.prg