Attendance confirmation to SFE Watch
registration for money to be paid into your bank, attendance is for the tuition fee
To clarify, you won't get either the Maintenance Loan or have your tuition fees paid, unless you turn up for the start of your course. Don't be confused by a university's "online registration" which usually happens sometime over the summer - that isn't the same triggering process for SF payments that murpo is talking about.
It's also worth noting that you will not get your Maintenance Loan in advance of your official course start date unless you have completed the SF Hardship process. So even if you register/enrol the week before your course officially starts, you will not get the money until on or after the official start date: