Screens is a way to define your screens.
Screens are presented as pages.
Changing pages can be by user control, or program control, or both.
Only 1 page at a time is shown.
Settings is a predefined page to edit settings.
A normal screenpage consists of labels and fields.
Labels are fixed texts
Fields are dynamic texts, presenting values from variables.
A screenpage is divided in a grid. The origin of the grid is top-left. The grid starts counting with 0,0.