This answer varies on a few things. Are we talking about computer manufacturers or software developers? Both play a big part of computers. Some of the worlds leading PC manufacturers are: HP, Asus, Toshiba, Dell, and Lenovo. As for software there are way to many to be named.
Based on 2009 facts, GM is the second biggest company in the world.
Dell is the third largest PC maker in the world after HP and Lenovo
If I understand you right, you can access any amount of accounts on one computer, it's just all the world saves will be in the same file for all the accounts. If you saved all the worlds on that computer all the accounts will have access to all the worlds in there.If you have two computers with a new world saved on each one then you will not have access to each others world. If you accessed one account from a strange computer then you won't be able to access your world saves from your other computer.The worlds are saved to your computer, not the minecraft servers. You can still start another world but then when you get back to your other computer you won't be able to access that world.
borax is the worlds harded subestance. second diamond.
the worlds second fastest car is the Bugatti Veyron 16.4
The United States has the second largest navy in the world, following China.
K2, also known as Mount Godwin Austen, is the world's second highest mountain.
The "first world" was the "old world," or basically Europe, before the discovery of the Americas. The "second world" was the Americas, discovered by Columbus. The phrase "third world" originally meant the rest of the world not included in the "first" or "second" worlds. Its meaning has changed over time so that now it means the poverty-stricken portions of the world.
worlds second largest animal is giant jeelyfish
India
With today's technology, there are many virtual worlds that exists. The most famous virtual worlds include World of Warcraft, Sim City, and Second Life.
The second most popular country in the world is Britain(First is America)