The KAMAR iOS App allows you to do this, using either your schools wireless connection or any 3G network!
For parents or students, they can check their own details, results, groups, etc.
For teachers, they have real time access to student and teacher information - including the ability to record attendance.
Using this application, teachers can view student information; including photos, caregiver details, pastoral, attendance, groups, daily notices and calendar. In addition, teacher details, timetable and attendance can be viewed.