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To follow up on the information Shawon shared, you can track time on to computers but will need to turn the Desktop app off on the first one before you can start logging time on the other.
You can't use the Desktop app and track time on multiple contracts at the same time, and bill two or more clients for the same time segment which represents time you've spent working on their contract.
Regarding logging time while working offline, Desktop app has a time-caching mode that can hold up to four hours of cached time, which will be automatically uploaded to your Work Diary once the connection is reestablished.
Please review these resources for more information, make sure the contract and your time is logged in accordance with the Hourly Payment Protection requirements, and let us know if you have any other questions.