how do groups work?

[Adam Katz]

Using kolab-webadmin, I can set permissions for a Shared Folder by
"UID/email/GID."  I'd like to set a folder to a group of users (GID),
but I can't seem to figure out what that means.  It's not a
distribution list ... how do I create a group of users for Kolab?

I'm not afraid of raw LDAP commands (though I'm certainly
unexperienced), but it would be nice if the webadmin panel did this.

(I'm using Debian Etch packages for kolab-webadmin 0.4.0-20060810-4
with kolabd 1.9.4-20060707.dfsg-2)