While I wouldn't recommend going against company policy, in theory, here's how you could potentially stream March Madness without your boss knowing during work hours:

Virtual Machine(VM): Use a Virtual Machine, or a separate partition on your work computer that contains a different operating system(e.g, Linux instead of Windows).Run your streaming activity with March Madness content on there . This can act as an isolated environment on your device.

Remote Desktop:

1. Connect Remotely: Connect to your work computer through remote desktop from a personal device, like your phone or another computer away from work(e.g, at home.)

2. Stream: Access and stream Marched Madness content on streaming services directly on your computer, without physically interacting with work devices/networks onsite.

Please note that the methods mentioned may not guarantee absolute privacy on monitored work systems so proceed with caution, and always prioritize adhering to the rules or policies set by your workplace to avoid possible complications