different sessions into one

[Johan Meskens CS3 jmcs3]

hello


i have a session of emacs open:
jmcs3@interlichtspielhaus:~$ emacs

now
 if i do:
jmcs3@interlichtspielhaus:~$ ps aux | emacs &

 , a second session of emacs will open

the same goes for when i call emacs from within perl scripts
 , each time new emacs sessions will open

how can i force the opening of buffers within the first emacs session ?

thanks
jmcs3