Speeding Up the Booting Process

[Star-Com]

Please clarify a few things about the Booting process :

Quoting from the article,

Guide to Windows Startup Tweaks
at http://www.pcmech.com/show/optimize/164/

Filter the StartUp folder

Filter? Well, what I mean is to go through the StartUp folder and make sure that there is nothing there that is unnecessary. It may be that Windows is loading up software that you no longer need, and that is a waste of time. To fix this, go to the Start Menu, Settings, TaskBar. Click the Start Menu tab, click Remove, browse down to the StartUp folder, expand it, and then remove any program from that folder which is no longer needed. More often, though, your computer is starting programs that are not showing up in the Startup Folder. You can also type "msconfig" at the Start Menu/Run prompt and control all of your startup programs and/or services. This easier method, though, is not available in Windows 2000. You will need to use a third party utility or, alternately, you can manually remove startup programs via your registry. etc...

Q1. Is there any difference between the terms Booting and StartUp?

Q2. Does Windows load all the programs on the Hard Disk at StartUp?(!)
Please explain the ''loading up software'' term?

Q3. I tried the "msconfig" command at the Start-Run prompt and the System Configuration Utility dialog opened up.
I clicked on the Startup tab and three columns showed up, a list of selected checkboxes of Startup Item, Command and Location.
What next? What does the Operating System actually do with these programs/commands? Which to deselect to speed up the booting process?