You can find a corresponding process using the Process Explorer utility. In my case it's the "java.exe" process from the "C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\jre\bin" folder with the following command-line:
"C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\bin\..\jre\bin\java" -Xms128m -Xmx1024m -Dsoapui.properties=soapui.properties -Dgroovy.source.encoding=iso-8859-1 "-Dsoapui.home=C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\bin\\" -Dsoapui.ext.libraries="C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\bin\ext" -Dsoapui.ext.listeners="C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\bin\listeners" -Dsoapui.ext.actions="C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\bin\actions" -cp "C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\bin\soapui-pro-5.1.2.jar;C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\bin\..\lib\*;C:\Program Files\SmartBear\SoapUI-Pro-5.1.2\jre\lib\jfxrt.jar" com.eviware.soapui.SoapUIProMockServiceRunner -m "Account creation mock" "C:\Users\User_Name\SoapUI-Tutorials\Sample-REST-Project-soapui-project.xml"
