Using this mod alongside Nucleus Co-Op makes it possible to play multiple instances of Stardew Valley on the same pc across multiple monitors.
Think of it as splitscreen, but instead of having half a screen each, you get your own dedicated monitor and if you like to, you can both play using two different sets of mouse and keybaord.
Replaces the hardware bound cursor for P1 with a virtual cursor, just like it works for P2-P4 in local Co-Op.
This is useful when running multiple game instances on a single device as all instances' P1 would otherwhise share the same cursor.
Source Code
Nucleus Co-Op