URL build trigger will add build to the queue when detecting changes at the specified url.
e.g. file:///C:/.BuildServer/system/artifacts/proj/conf/artifact.xml,
ftp://admin:admin@172.168.0.2:2121/dir/artifact.zip,
http://svn.jetbrains.org/teamcity/plugins/url-build-trigger/trunk/build.xml.
Trigger poll interval in seconds. Default value is 30 sec.