[plug] restarting services without rebooting

[sol]

This is only a small problem. I've got a webserver with the user "webmaster" 
's home directory set to /var/www (as opposed to /home/webmaster). For 
reasons that aren't worth explaining I need to change that so that there is a 
/home/webmaster. I can do this and edit /etc/passwd so the new home directory 
is set, but how can I get the system to recognise this without rebooting? In 
other words which service/daemon do I need to restart to get the system to 
recognise the new configuration?

ta,
sol