- left button
To apply the current action to an object, you have to select this
object.To select an object, you have to move the cursor to a point
belonging to its area then press the left button of the mouse.
For example, you want to delete a box and a link in the
canvas window:
first, select the cut action in the menu bar or hit "Ctrl d"
click on the first box and on the second one with the left button.
- middle button
To go down in a box or in port, press the
middle button of the mouse.
- when you go down in a box,
a new frame is opened and the text window appears, you can:
- draw another boxes, links... in
the frame, these objects are internal objects of the box.
- type text in the text window and
then click on the button "Ok", then the text is associated with the box.
- when you go down in a port, there
is no change in the canvas, but the Signal declaration associated with
the port is displayed in the text window; you can modify this
declaration and then click on the button "Ok" to associate the new
declaration to the port.
- middle button with Ctrl key
when you press the Ctrl key and the
middle button on a box, the interface of the Signal expression is
displayed in the text window and can be modified.
Example : if you click in the box with
the middle button and the Ctrl key pressed, you will have in the text
window the interface of the box; if a port has no declaration, it is
represented in the interface with the sign "~".

- right button
To go up from an object (a box or a
port), press the right button of the mouse.
- Drag mouse
some actions need to drag the mouse,
it concerns the box creation, the
object moving, the box sizing, and the glue. For these actions,
you have to click (press and release) with the left button, drag the
mouse and to terminate the action, click (press and release) with the
middle button.