It is a client that allows you to fly, have super jump, super run speed, and be able to walk through walls.
Classic is not available for download; it is only playable on the website. There are, however, special downloadable "client wrappers" that provide extra features, like hacks; WoM is a good example. Google search "Wom client" and follow the directions at the WoM website. u cant. I assume that you mean Java, as minecraft classic is not something you download, so search java and download it.
To get WoM client, you must register for an account at WoM's website (Link listed in Related Links), then confirm your email, and go to the download section of the website.
WOM (in MineCraft) can make you run really fast, fly better, and go through walls. That's all I know because i have a friend that has WOM and he has shown me it.
only on single player with WOM.
Yes, pigs are available/roaming in Minecraft classic.
You can't have commands on minecraft classic but you can in multiplayer classic
There are no rails and minecarts in Minecraft Classic.
Minecraft Classic is an outdated but free version of Minecraft. you have no health. unlimited blocks. Alpha terrain.
Minecraft no longer supports the free Classic mode. However, no, torches were not avaliable in Classic.
No; diamonds were not yet implemented in Minecraft Classic. (v. 0.30)
Client outdated means that the client (the software used to connect to the server) is out of date. You need to update your version of Minecraft.
No, a Minecraft account is not free. You must buy it for around $25.00 or so U.S. dollars. You pay only once, and once you buy it you can change your skin on the website and download the free Minecraft client.