- users of a specific web browser - with checkboxes
- users of a specific platform (Linux, Windows, etc) - with checkboxes
- users of a specific Operating system (Windows XP, etc) - with checkboxes
- users of a specific web browser - with checkboxes
- users of a specific platform (Linux, Windows, etc) - with checkboxes
- users of a specific Operating system (Windows XP, etc) - with checkboxes