Forum:Stopped? Not sure what command to access my game

Oh, hello.

I was several hours into a game that I wanted to keep on playing, and I mashed some key by accident giving me the following message:

[1]+ Stopped nethack

When I try to start up nethack again I get the message:

There is already a game in progress under your name. Destroy old game? [yn]

Obviously I'd rather not. What does this mean and how can I access my game?