Can you explain what you are trying to do? This thread is a mess and contains several topics. What devices (phones/PCs) are involved? Which one is server and which one is client? Where is external mouse connected? At least N900 can show mouse cursor. E.g hack from: http://talk.maemo.org/showthread.php?t=42485 or package http://maemo.org/packages/view/extmou/