I use the software from that site.
the Pc site also stalls not only moving the mouse sadly but also when the amiga does anything like for example accessing the harddrive or calculting something. For a mouse being used via the pc side i would need to install a mouse driver.
I know the software hooks into the amiga site and captures mouse inputs and ofcourse amiga inputs so i can use the amiga keyboard on the pc site but that how its always should be anyhow and normally should not cause any problems. (otherweise the outrage would have been huge in the community for 22 years now
