# install
apt-get install boinc-client boinc-manager

# as root start the service
root@knoppix:~# /etc/init.d/boinc-client start
[ ok ] Starting BOINC core client: boinc.
[ ok ] Setting up scheduling for BOINC core client and children: idle,.

# as non root
su knoppix

# start the manager
boincmgr

# the setup assistent should allow you to connect to your existing accounts or join a project creating a new account
admin