It is possible to use the Kiosk mode of your iPad to prevent employees from being able to navigate to other websites or even use other apps. This is particularly useful if you want to prevent any downtime in the availability of the clocking terminal.

IMPORTANT: You may want to plug your iPad when you set in Kiosk mode, has it will always be open (never shutting down or falling into sleep mode).
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Here is a video on the procedure:

Would you rather understand how to clock in with a fixed terminal? Click here.