Minecraft: Same person, different IP & user name?

If I were to log onto a Minecraft server with one of my characters, log off, and then log onto the same server with a different character (which is also paid) on the very same computer, but I'm on a different IP address because I'm at a friends house or using an IP changing program…

Would the server OWNER be able to tell that these two different characters have been played by the very same person?

Does anyone have a 1.7.9 minecraft server that they don't use?

Almost all the youtube videos on how to make a minecraft server don't work so does anyone have a server that no one knows about and that they don't use

or

does someone know of a video that really works and has been proven working?
that i and my friends can play on together?

Google chrome - network errors - problems?

So every time I go on google, this message pops up:
SSL CONNECTION ERROR

and whenever i play minecraft, it kicks me out and it says "internal server error" or something, so i tried redownloading minecraft ibut it says failed network error

my internet connection seems fine but i'm really stressing out help what should i do

Added (1). i have sony vaio windows 8

Things to do in Minecraft Multiplayer?

So I go on this server regularly and I'm running out on ideas to do. I'm stocked up on EVERYTHING. Diamonds, Iron, Gold, Cobble, Wood, you name it. So I need ideas of more things to do/build, because it it just getting boring.

The server is a simple survival server, where you can build you own town or join another town, no factions or any of that stupid stuff.

IP - friendlyuk.gamename.net
Website - friendlyminecraftuk.enjin.com

Extreme amounts of lag on my modded Minecraft server?

My friends and I have decided to make a private server that we decided to mod. The mods work, but we have extreme amounts of lag.
The specs of my computer are as follows:
Core i7 3.9Ghz
16GB DDR3 RAM
NVidia GTX GeForce 660
2TB HDD
120GB SSD

I'm the one running the server. Normally, on vanilla minecraft there's a little lag but not as bad as it is currently.

I want to be a staff on a minecraft server (Builder)?

Hi guys i wanna be a builder on a minecraft server, i would of created my own server but i don't know how on windows linux so i build good and i'm active and you could test my builds to make sure that i build good.

Minecraft Multiplayer Registering Problems? Quick?

Every time I go on a server, I have to login or register. The way to register is /register (password) (ConfirmPassword) so I do that and then it says "Username already registered". I have never been on this server before. I then try to login and it says invalid, and disconnects me. I haven't bought the game, but I get on SOME servers fine. (Some say i should try restarting my game?) Someone help me!