Gns3 gives you provision to connect PC with operating system to your network topology, in this way you can perform many important practicals like communication between two hosts running cisco-ip-communicator over voice topologies etc.

so let's get started
following are the software requirements.
1. Gns3 virtual box edition - Download here
2. Oracle virtual box - Download here
3. Operating system - we will use windows xp as operating system

Steps to be followed.
Step 1 . install gns3 virtual box edition and oracle virtual box on your system.

Step 2. Install virtually windows xp in oracle virtual box.
Step 3. Now open Gns3, Click on edit and follow the path

Edit > Preferences > Virtual box


Step 4. In the General settings tab click on the button "test setting" if virtual box is installed properly, successfully started.



if virtual box is not installed following error will be there.



Step 5. Now go to virtual box guest tab. Here put some name in identifier name field and then drop down the vm-list option and select the vm installed in oracle virtual box with xp operating system.



Step 6.  Click on the save button and apply OK.

now from the device menu > drag and drop the virtual box guest.

connect the device to your network topology and start the topology.

Now you have a PC attached to your Gns3 network topology.