A Gambas programme consists - with a view to the programme windows existing at runtime - of

• a (start) window or
• one (start) window and further windows or
• an MDI application in which several top-level windows are inserted into one main window.

If one takes the type and number of programme windows as a criterion, one can distinguish the following types in a Gambas programme:

• programme with exactly one single window,
• programme with several individual windows,
• MDI programme as a programme with one main window and inserted top-level windows or
• programme with exactly one single window and at least one embedded but externally started programme (embedder).

Figure 12.0.1: Use of the Embedder class