4) Cursor's movement emulation and refresh of board status on TV screen..
Each time when the mouse has moved, the new location of the cursor is computed. If the cursor has gone into a new cell on the board, the new cell will be updated with an icon that shows the cursor. The old cursor location also need to be restored to the original icon before the cursor moved there. mc2 send the the locations and icons for both the old and new cursor to mc1. mc1 will draw the two icons accordingly.