When a booking is cancelled or allocated, the token that was used to make it may be refund, depending on several variables. A token contains a second set of attributes which may be broader than the first set and is used if a booking is being made less than 4 days in advance. Tokens may or may not be refundable. Non refundable tokens convey the right to a certain amount of terminal time. When it has been used up, it is gone.
Refundable tokens convey a share of the available terminal time.
The more one has, the greater share of the available time can be booked and hence used. Class It is useful to group users together into classes for the purposes of token allocation and class bookings. When a number of tokens are allocated to a class, that number of tokens becomes available to each member of the class. Similarly if a booking is made for a class then the workstations reserved for that booking are made available to any member of the class. Class membership is recorded using netgroups.