what is the best and fastest way to communicate between two applications?

Question

I made a java program just for fun this program allows you to control the seconds computer mouse using the first computer's mouse. so everytime the mouse moves some the x and the y of the cursor is sent client application. which then uses the robot class to move the mouse. right now I am using sockets to communicate and it is really slow what is a better way to do it any help would be apritited. if possible please provide some code thanks