Ubuntu :: How To "turn On" Compiz

How do I tell my Ubuntu 10.04 and/or 10.10 installations (I have both) to *use* Compiz now that it has *evidently* been installed?BACKGROUND -I installed Docky and some other gadgets (Cairo Clock, desktop calendar) that informed me they couldn't be properly displayed unless I "enabled compositing". What I did in response was install xcompmgr, then used Start Up Applications to start it upon boot. Doing that enabled Docky and those other gadgets to display properly: my hardware thus seems capable of supporting compositing to some degree.

Later I was informed that xcompmgr was old and inelegant compared to Compiz. So I used Synaptic to install several Compiz packages. I now have a bunch of Compiz configuration panels and tools, *scads* of options(!), and a panel button.PROBLEM -What I haven't been able to find in all of those wonderful Compiz GUI controls is a way to tell Compiz or my Ubuntu 10 installations to run Compiz. So I can't seem to "turn Compiz on", either in real-time or at boot.The result is that if I disable xcompmgr, then run the Compiz configurator tool, compositing remains disabled such that Docky and those other desktop gadgets don't display properly.QUESTION -

Maybe I've made the wrong assumption, but given the width and depth of the Compiz GUI tools, I would suppose somewhere in there would be a way to tell Compiz or my Ubuntu 10 installs to start and use Compiz on boot, etc.But I can't find those controls. Do I instead need to run a command line? (Seems counter-intuitive given the huge number of Compiz choices I now seem to have, but Linux can sometimes be that way.)For that matter, is my first problem perhaps the I need some way to simply verify that I have all the Compiz stuff I need?