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>Win-1 is file explorer, Win-2 is web browser, Win-3 is email, etc...

Is this something you set up natively in windows? Or are you using AHK?

The numbers 1, 2, 3 refers to the task bar position.

If you order the programs that way on your task bar, then you can access them with these shortcuts.

Lol, I've been using Windows for a long time and had no idea these shortcuts exist - I will probably use them all the time going forwards.

That's just default Windows functionality, the numbers correspond to the order of items on the task bar.