Below is the LaserWeb3 startup script I am running on Win7 machine, assuming that LaserWeb3 has been installed into E:\LaswerWeb3 directory. I added sleep command (3 seconds) to make sure git pull completes before running LaserWeb. LaserWeb3 installation instruction is located at this link: https://github.com/openhardwarecoza/LaserWeb3/wiki/Installation-Instructions
start /d E:\LaserWeb3\ /b git pull
sleep 3
start /d E:\LaserWeb3\ /b node.exe server-smoothie.js
start /b chrome.exe --app=http://localhost:8000/