For example after installing CIS and updating it can I use my computer during half a year (or year) without internet ?
Can I suppress any CIS alerts about updatings ?
Can I update CIS via floppy or via CD or using flash etc ?
Or is there no point in installing CIS ?
if you plan to have no internet connection at all with your computer then I don’t see a point in installing CIS, for you wont have much use in a firewall or the AV.
Though D+ could come in handy, depending on what kind of software you plan to install on the computer itself, as your AV would be out of date.