list sessions on the remote end

Hello,

after lunching the command new-psssession on a client computer what exactly happens on the remote end ?

is a new powershell process lunched that will whait for commands ? (i didn't see any);
is there a command that will show me details about the pssessions on the server receiving them ? ( what user is connected and how many sessions does ho opened)

what happen with the conection after is no longer used ? how long will still wait for new commnds ? can the performance of the server be affected by to many remote sessions ?

thanks,

Marius