Technically it works directly, but with e.g. multi-pointer X you can bind HIDs to a pointer (aka cursor), and control them independently and concurrently as lon

Technically it works directly, but with e.g. multi-pointer X you can bind HIDs to a pointer (aka cursor), and control them independently and concurrently as long as you don't confuse the applications you're interacting with. I think Emacs is tolerant in that respect, but beyond that, some trickery is likely required to make this work (i.e., multiple browser instances).