Trick no.1: A browser called Maxthon, which is freely available on the net has a functionality call the 'Boss Key'. This is nothing but a feature to hide the browser. There is a shortcut to hide and unhide the browser Alt + ~ key combination like a toggle switch. The option can be found in File Menu. If you are not allowed to download this software from your workplace, transfer this via USB drive/CD. So now you can surf and use the 'Boss Key' to hide the browser.
Trick no.2: On the same lines as above, here we have an application called the 'Boss Key' which hides the active application, be it a browser, folder, application etc.. This software is freeware and released by EfreeSoft. All it does is it allows you to hide active program window immediately using a hot key. It's speed is brought to maximum to allow you react as quickly as possible to any threat that appears. You won't feel even a slight difference in the performance of your home or office computer after installing it.
Friends if you have any other methods, please share this with us via your comments.