You press T to talk.
you can press T to talk
./msg steve hi
No, the only way is to have a high-ranked person unmute you. In the meantime, use signs to talk.
press the T button when on a server with other players and type your message. all players will see it
You press T to talk.
How? You can't.
no, but you can do a skype or hangout with who you are playing with while you are playing minecraft with them.
Yes you can.
you can press T to talk
Rcon allows for a client to talk with the minecraft server (think remote console)
Press 't' to talk.
Not on single player. On Multiplayer you can though.
./msg steve hi
I don't think so. sorry...
Nope, not without you installing a mod, like girlfriend mod.
You don't, but notch plans to add voice chat sometime soon.