Sometimes a program is written which is just too good. It solves a problem that millions have suffered from, millions have complained about, but no-one actually had a sensible solution. Until now.

Office workers rejoice. You all know that the only good thing about sitting around fiddling with paperclips all day is that you can go play on the web now and then. If you keep it subtleish. However, even the dull news sites give themselves away by being all gaudy and animated, unlike your average tedious report or spreadsheet. People looking over your shoulder will soon see what you're up to, and a sacking may come your way. Expert work-slackers are familiar with such cunning techniques as the Alt-Tab, Alt-F4, Windows-M, and other such shortcuts which hide the visual evidence of your misdoing quicksmart. Even these though don't always work as you expect them to, and in themselves make it look like you're doing something you shouldn't, even if it is just staring at a blank screen all day.

Enter Ghostzilla. Billed as the invisible browser, it has a set of features second to none for clandestine work-dodgers.

Get this: firstly it draws the webpages inside whatever program you are currently working in. For instance, if you're in your email program, then where your inbox would be you will actually see the web. Most staff observation is probably done from afar, so already you have an effective skive tactic. If your boss looks over, it will look exactly like you're doing your email.

But, the Poorhouse hears you say, it won't look exactly like work will it? Who deals with emails, spreadsheets and reports full of uber-coloured graphics and animations and the like? Enter the six camouflage modes, to allow you to tailor its output to your own personal level of stealth. As an example, the default setting changes all the text to look mega-bland grey, and hides any big pictures. If you wish to see a picture, then just hover over where it would normally be, and hey presto it's there. Only it's been magically made black and white. No colour = no fun = must be doing work, right?

However, all this can't serve much against a deliberate screen spy from a colleague standing right next to you. Yes, it looks boring, but if they are there actually reading your screen, clearly the game is up. Or is it? Not if you have some half-decent reactions. Simply move the mouse away from the web browser, onto any other part of the screen, and the web page magically vanishes to be replaced with the real contents of the program you are supposedly working in. When danger passes, a simple mouse-flick brings the browser back.

This sounds like perfection. It even works. What's more, you don't need to install anything. It'll run right off a CD or a USB drive if that's easier to smuggle in for you. The only file it will leave when you're gone is a user-configurable encrypted file of your settings, history etc. which if you wish can itself be on a portable disk. Flawless.

Be warned though, the one thing it won't do is erase any server logs. Any company with a half-decent IT staff will, if they bother to keep and look at the logs, be able to see that someone has been visiting websites. So you might still be found out, but at least you have the satisfaction of knowing someone had to do some work to discover your dirty little secret.

Ghosting in Excel