How do you pee if this is attached to you? Do you keep a bunch of one-gallon jugs next to your desk?
Step 1 - You get up and go pee.
Step 2 - You come back to the computer and press the power button.
Step 3 - You continue with whatever it was you were doing before nature called.
Not all that difficult for a select tiny few, though I can see how most people would be confused and bewildered at the requirements.