Is Google going to reboot the way we use PCs? BlackBerry plays catch-up.

If you want to revolutionise computing, you have to be bold. When Apple unveiled the original Bondi-blue iMac in 1998, there were howls of protest at its decision not to include a 3.5-inch floppy-disk drive.

"How are we going to cope?" people whined. "What on Earth is Apple playing at?"

Apple, of course, was right, forging ahead to a bright new future.

Next week, Google will make a far bolder move in launching its first "Chromebooks", made by Samsung and Acer.

The machines, which were made available for pre-order yesterday in the UK, break all conventions. There's no desktop, just an internet browser window, and their functionality is almost entirely dependent on internet access. There is no software to install, just applications running across the internet - and there's nowhere to store your files.

Well, technically there is, but it's not something Google is crowing about because these are machines for the internet age, operating almost entirely in the cloud. Google's operating system, Chrome OS, doesn't just bring cosmetic change, it's beating an entirely new path.

Both the Samsung and Acer Chromebooks are rare in the wild prior to their UK launch, but Google has been touting a preview machine to demonstrate the functionality of Chrome OS.

Its advantages and its drawbacks both centre on its simplicity. If, like me, you're one of the 160 million people who already use the Google Chrome browser, the look and feel of the display will be familiar. Indeed, once you've signed into your Google account, it's as if you were browsing on your other computer, with all your bookmarks, passwords and extensions intact.

This underlines the benign nature of these computers - they're effectively just shells. Sign in to Google using someone else's Chromebook and it'll feel just like yours.

All your work is done in the browser window. Apps are available from Google's Web Store (many of them free) for word processing, diary keeping, e-mailing, photo editing and much else.

The machine feels quick, responsive and relatively immune to viruses, and the battery lasts for a full working day.

But where Chrome OS scores highly for computing novices, it fails for those who demand a little more. Photo editing is a case in point: apps require you to upload your images, work on them in the browser, then download them again when you're done - something that seasoned Photoshoppers will find frustrating.

You can't connect a printer to the machine directly; you have to use Google's Cloud Print service, which sends print jobs to a machine you've nominated that does happen to have a printer connected to it.

The main worry, of course, is that without a connection to the internet or a cellphone network (if you fork out for the 3G option), you're left with a brick of a machine, with your documents and e-mails inaccessible.

There are privacy issues, too, surrounding cloud computing. Google will be vaguely aware of the kinds of things you're up to - but it will probably do a better job of looking after your files than you would, so it's swings and roundabouts.

The main factor dissuading us from going Chrome right now is probably the cost. Samsung's machine is comparable in price to the iPad, and you wonder why you'd opt for an internet caf[c] experience on a laptop over a sleek, touch-n-swipe tablet.

Chrome OS has been hailed as the advent of "cheap, easily accessible computing", and yes, it does feel like a genuinely new approach, right down to the dedicated "search" button replacing that useless old Caps Lock key. All we need now is for a manufacturer to sort out the "cheap" bit.