Are D-Bus and Hal needed for a virtual server?

I have a Xen-based Centos 5.5 virtual machine running as a server - Apache, OpenSSH, MySQL, Tomcat, Nagios and ISC Bind. It is currently running both d-bus and hal-daemon. Are these needed or can I safely turn them off?

From serverfault Robert Munteanu

• Well... you can turn them off if nothing needs them. Kill D-Bus, and if nothing rolls over or complains then you can kill hal as well. "And the like" isn't specific enough to give any sort of an answer.

  Robert Munteanu : Thanks for the answer. I've updated the list of main apps which are running on the machine. I stopped them, and nothing seems to complain in `/var/log/messages` or other locations. Is there anything specific I should be looking for?

  Ignacio Vazquez-Abrams : Not really. Just... stuff not working as usual. The apps you list don't normally use either, so you're probably fine.

  Robert Munteanu : Right, thanks .
  From Ignacio Vazquez-Abrams