Summary

Use the main function for:

• Creating all windows, buttons etc.
• Initialise your application
• Then call main_loop

Use call-backs for:

• Making things happen
• Use show_window to show already created windows
• Use hide_window to hide windows without destroying them
• Don't create windows inside call-backs unless there is a very good reason

Use drawing:

• Only draw something if you want graphics
• Labels, text fields and text boxes will usually do for text