How to send hid mouse and keyboard output to serial port to anohter computer.

Okay my use case is I need to send mouse and keyboard commands from a matlab program to another computer. I ran across an arduino program that will do that and if I have to I will get an arduino to send the commands and control the arduino with matlab. But my prefered anser is to use two usb to serial adapters with a null modem cable inbetween the two computers controlled solely through a matlab program. I am looking for the software library to emulate an HID source keyboard and mouse that I can link to a matlab program. If there is a cleaner way that you know please inform me. Otherwise any help will be greatly appreciated.