Ok, so I am sure you have all wanted your own web-browser or other program on a computer that won't let you download or install them. Well this is a shortcut that is easy and non-harmful. So lets get on with it!!!
Step 1: First Things First, Get a Browser
So to do this you will need a mobile browser like the Opera or Google Chrome.
http://www.opera-usb.com/ or http://portableapps.com/apps/internet/google_chrome_portable
Ok, so now you can run your own browsers off your flashdrive, and if you wan't even put the files on your computer, but those modified versions of software are slow so what do you do? Well you have to wait for an update you may be able to find an outdated version or a way to force update.
I will be posting the the outdated usb drive version when I have a chance to pull it from a school computer sometime soon.
Normally you wouldn't be able to update software, but because you are running from your flash drive you can, instead of updating your flashdrive-version it actually puts the new files in the program files and installs right onto your computer. Wonderful!!! No more ugly IE, and you can have your own look, and your own home-page.
old versions link: http://opera-usb.com/downloadold.htm
Step 2: Now Time for the Fun Stuff
Now you can play in-browser games, update flash and java, and download files. You can do this with almost anything as long as you can make it run off of your flashdrive. You can also download, and set your desktop background because nobody has set restrictions on your program you installed. Now you must be careful because if a computer sync is performed to make them all matched it has a probability of installing your program on every computer on the network and then you will probably be noticed.
Step 3: Games
I have minecraft and love to play it. I never would play it at school or work, but if you wan't to here is a tip that may interest you. Minecraft builds itself within the program, so it doesn't have an installers. Just double click on the program right in your flashdrive and it will install to the computer.
Step 4: This Is Not Bad in Any Way
There is nothing wrong with this as long as you are using safe trusted software. I don't recommend using games, so you don't get in trouble.
My goal is not to go against rules or anything like that, I am sure that every network administrator on the planet would love to have things other than IE on all the computers, but they don't have time, so we don't get them. If my the school super saw my opera browser he would probably ask me to do it to his computer.
Look at all these cool OK photos I found :)