While designing your test steps in QC for automation tests in test plan module, Test Script tab is availble. You can generate script here or copy from your automatioon tool. While running your tests, it will ask for on which host you want to run. You need to select the system in your network. Then run it. Before going to run your script in a system, the automation tool, like WinRunner, must be installed on that system. Otherwise you will get an error.