  E831-FOCUS is a photoproduction experiment which collected data during the
1996/1997 fixed target run at Fermilab. More than 1 million charm particles
have been reconstructed. Using this sample we measure the lifetimes of all the
weakly decaying singly charmed particles, establishing the charm lifetime
hierachy. Then we present recent results on semileptonic decays of charm
mesons, including the new s-wave inteference phenomena in D+ to K-pi+mu+nu, and
high statistics branching ratio and form factor measurements.
