...When the day changes the overtime is calculated as the sum of previously calculated overtime plus work time from a given day minus working day as you define it.
Suspend, hibernate, screen save and time change events are handled asynchronously.
IPv4 address change is recognized and work is counted only when the IP address is from the provided range.
The program may keep track of applications active in the foreground. Every 5min there is a check which is the foreground window. Weekly or monthly stats are available (including foreground application stats).
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