I'm sure all of us have used the Actions and Components tabs of the ConfigMgr Control Panel applet to help determine when the client has completely initialized and I have a pretty good understanding of all the logs in the Windows\CCM\logs folder and the ones I use to determine when the client has completely initialized but I was curious what others use or if there was one log in particular and one entry in that log to look for, that tells you everything is ready to go.