Is your feature request related to a problem? Please describe.
When using the radio function in a classroom setting with the simulator, it is intuitive to use the https://makecode.microbit.org/---multi# editors and, for example, have the sender program in the left editor window and the receiver program in the right.

Describe the solution you'd like
I'd like to be able to make a link that opens 2 shared projects, the first in the left window and the second in the right window, maybe with some custom magic URL, maybe like this:
https://makecode.microbit.org/---multi#_YTbKYAAimAxz&_LxghRpHJaKq8

Describe alternatives you've considered
I have found no alternatives.

Additional context
The feature has been discussed on the forum:
https://forum.makecode.com/t/editor-magic-url-flags/10743/5?u=vegz78