How do I scan for the nonpresence of a service or registry key?

Re: How do I scan for the nonpresence of a service or registry key?

It will only return results for computers that have the service installed on them. What you could do is run the export, and then run a computer export to get your list of computers, then compare the two lists with Excel or Access.

[bowulf]

What I would like to do is scan for a nonpresence (i.e. not installed) of a service, SNMP, etc. I can filter for the service or scan for a particular registry key, but that will find only those it succeeds in finding. What I really want is just the list without the key/service present. Is that possible?