Session prolongation (additional payment)

Select computer or time from time list and press SHIFT +ENTER. ADD TIME dialog appears. Enter additional time duration and press OK.
You can do the same by right mouse click on computers or time list.

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You can add time to several computers simultaneously only if their session ends in exact same time. Otherwise you have to do it separately.
From TABLE view you can add time to only one computer at a time.
ADD TIME feature does not change current time, it only adds additional time to current time. Additional time has system note 'additional payment'