In this tutorial, I will show your how to remote control your desktop computer from a Nokia S60 or a Sony Ericsson UIQ mobile device. All you need is a software Remote PC2. It consists of a client and a server component. Here are some of the things you can do with this freeware application:

-View complete desktop on mobile device and zoom upto 8X
-Chat between mobile phone and computer
-Shutdown and restart computer from mobile phone
-Connect over GPRS/3G/UMTS/CDMA internet connection or locally via WLAN/Bluetooth
Configuring the Server component:

1) Download and install Remote PC2 from here

2) There should be two files in the downloaded package- a JAR file (RemotePC2.jar) which needs to be installed on your Java J2ME supported mobile device like Nokia S60,Sony Ericsson UIQ Motorola or Blackberry. The second file, RemotePCServer.exe is the server component which needs to run on the Windows desktop.

3) Configuring the server component is not difficult.
On the Main Menu tab, you can specify a username/password which will be used to connect. If you will be connecting via GPRS, enter a unique connection port number like 54123 (max is 65,535 port) not conflicting with another common port like 80(http),443(https), etc

4) Optionally, you can choose to start the server when Windows starts. Click on Start Server.

5) For Bluetooth connections, go to your Bluetooth software (Widcomm,Microsoft,etc) and add a Bluetooth serial port. If there is an option like “Remote device will start the connection”, choose that option. Then go to the Bluetooth tab in the Remote PC2 program, select the BT serial port and hit Start Server.

Configuring the Client component:

1) Install RemotePC2.jar on your mobile device

2) Open the software on your device. If you are connecting via GPRS, enter the Server’s IP address and the Server connection port.
Note:
a) If you are connecting via GPRS/3G/UMTS/CDMA over the public internet, you need to specify the external public IP address of your computer assigned by your ISP
b) If you are using a computer behind a Wireless Access point, enter the router’s external IP address and make sure you forward the port specified in the server component (eg 54123) to the computer running the Remote PC2 server software
c) If you are using WLAN internally, enter the internal IP address of the desktop computer (eg 192.168.x.x) hosting the server

3) Enter the username/password you specified ealier. Hit Connect/Search
.
4) If you are using Bluetooth, do not enter the Server IP and Connection port. Just enter the username/password and hit Connect/Search. The client will try to find any Bluetooth enabled computer in the vicinity and connect to the server.

I haven’t tested this with WLAN but if it works, please let me know so that I can update this tutorial.