I tried the app on Win10 system, in multiplex mode (or the switched input mode for that matter). I open 2 Windows Paint instance and use 2 physical mice to sketch at the same time, but only 1 will work.

It seems that for every mouse to work, it need to click once first then can start click, drag action.

In addition, can I check if it is possible to send coordinate info to the 2nd mouse programmatically instead of reading from a physical mouse device? I am interested to get the SDK. Please kindly contact me to discuss the details.

Thank you.