How to enter in a Docker container already running with a new TTY

I have a container that is running the Apache service in the foreground. I would like to be able to access the container from another shell in order to "poke around" inside it and examine the files. At the moment, if I attach to the container, I am left looking at the Apache daemon and cannot run any commands. Is it possible to attach another tty to a running container? Possibly, I can take advant

[nacika_inscatolare]

docker 1.3 から docker exec であたらしいtty開けるようになってたんだ・・・