help with computer Device Manager

[jumpy]

I was going to ask this in another thread, but it got locked before I could post
Looking at drivers for a certain bit of software, which I shall not name here, but of which we are all aware, I am checking out the 'show hidden devices' in the computer managment device manager window.
When you double click on the driver a panel pops up with 2 tabs on it- 'general' and 'driver'. On the 'driver' tab there are a number of entries:

service name.
display name.
current status.
startup.

The one I am interested in is Startup. There are several options as to how the device/driver should function:

Automatic
Boot
Demand
System
Disabled

The driver(s) in question are set to Boot- presumably meaning that when my computer starts the driver is initialised too. Now perhaps, for reasons of preserving some parts of my computers hardware from damage (speculation), I want to stop this driver from loading automatically, except for when a certain application calls it. Would I be right in assuming that if I set these drivers to Demand, then it will only run actively on my system when I put the disk containing the application into my DVD-RW drive and spinn it up?
I've tried to be circumspect with my language on this one so as to get a purely technical answer, but fear I might have let the cat out of the bag if ppl have strong oppinions on this unmentioned topic.:/\:
If anyone has some clue what I'm saying then please let me knnow if my assumption about driver operation is correct.
Ta.