>>I tried using window messager in windows XP Pro SP2 to do remote access to my client place which can be done. However, I tried it again to others PC in same place and get me the result is cannot works. I appreciate if anyone could provide me more information and the requirements or window setting. Thanks in advance

>If I remember well WM must be runned on both computers and Remote Management (I can't remember the exact name) must be allowed on remote computer. Then when you try to access remote computer somebody must allows you to remote management. This is not as Remote Desktop on Servers :o(

Remember that Remote Desktop uses special ports... and if you are running a firewall (software or hardware) they might be blocked. As to what ports, search the net or search here on Universal Thread, you will find them in other posts.