Johannes Jost Meixner
The handbook currently states that USB passthrough is not possible without an extension pack. This is incorrect, virtualbox-ose is merely limited to emulating a USB1.1 host controller
Some comments, Warren might have others.
I think the "In order" can be removed.
you and your should be avoided. How about "... attached to the machine, the user needs ..."
Isn't that the operator group? It should be enclosed in class=groupname tags, see FDP primer, section 9.6.8.
Same here with "you". Restart the login session...
Small formatting nit, should have caught that earlier... :-\
OK, last thing: you need to break the overly long line after the <systemitem tag and indent the class=".." in the next line, and rewrap the rest of the paragraph as appropriate.