Filter list - show the entries not matched

Hi

I am using a simple filter based on a list of company names to filter-out companies of relevance from a database. What I need to do then is to find out, which of the companies in the filter-list that is not represented the output = which of the companies in the filter that was not found in the database.

Any suggestions for a method will be appreciated :)

Best regards,
Laksefar - Denmark
SAS 9.2 and n00b