Image Aquisition Toolbox, islogging versus isrunning confusion

Hello, I have a couple of questions over the IMAQ toolbox.

1: Im getting confused over the checks islogging and isrunning. Which one actually checks whether the camera is collecting light? (The documentation isn't very clear)

2: Is there anyway to flag the start of the camera collecting light (I dont mind how the camera is setup, i.e. trigger manual or immediate, but Im only collecting 1 image). The reason I want to flag the start of the camera actually collecting photons is I want to also send a command to a laser to turn on 200ms after the start of the camera collecting photons.

Thanks

Jason