-<P>Filters can be set for spots, announcements and WWV. You will find the
-directories for these under /spider/filter. You will find some examples in
-the directories with the suffix <EM>.issue</EM>. There are two types of
-filter, one for incoming information and one for outgoing information.
-Outgoing filters are in the form <EM>CALLSIGN.pl</EM> and incoming filters
-are in the form <EM>in_CALLSIGN.pl</EM>. Filters can be set for both nodes
-and users.
-<P>
-<P>All filters work in basically the same way. There are several elements
-delimited by commas. There can be many lines in the filter and they are
-read from the top by the program. When writing a filter you need to think
-carefully about just what you want to achieve. You are either going to write
-a filter to <EM>accept</EM> or to <EM>reject</EM>. Think of a filter as
-having 2 main elements. For a reject filter, you would have a line or multiple
-lines rejecting the things you do not wish to receive and then a default line
-accepting everything else that is not included in the filter. Likewise, for an
-accept filter, you would have a line or multiple lines accepting the things you
-wish to receive and a default line rejecting everthing else.
-<P>
-<P>In the example below, a user requires a filter that would only return SSB spots
-posted in Europe on the HF bands. This is achieved by first rejecting the CW
-section of each HF band and rejecting all of VHF, UHF etc based on frequency.
-Secondly, a filter rule is set based on CQ zones to only accept spots posted in
-Europe. Lastly, a default filter rule is set to reject anything outside the filter.
+<P>CVS stands for "Concurrent Versions System" and the CVS for DXSpider is held
+at
+<A HREF="http://www.sourceforge.net">Sourceforge</A>. This means
+that it is possible to update your DXSpider installation to the latest
+sources by using a few simple commands.