'Custom' openings are windows, vents, doors, holes, sub-surfaces drawn by the user. They are shown in bright colours at zone, surface and opening levels in the Edit screen.

'Default' openings are windows, vents and doors generated automatically by DB using Facade model data (window to wall % etc) , as opposed to 'Custom' openings which are drawn by the user. Default openings are shown in grey in the edit screen at zone, surface and opening level.

The time including daylight saving, the time on people's clocks.

The time excluding any daylight savings. For example Greenwich Mean Time (GMT).