How can I swap between Hard Drives on one Monitor?

Okay so I have 3 external hard drives and one laptop. I do have a OS on each of these external HD. How can I use one monitor (my main laptop) to switch over to each hard drive quickly like I run one task on my Windows 8 hard drive then jump over to my Windows 7 hard drive but doing it all on one screen?

I didn't find the right solution from the Internet.

References:
https://www.computerforum.com/threads/how-can-i-swap-between-hard-drives...

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