Hotline supports URLs via Internet Config. That means if you have Internet Config installed, you can command-click on an URL and the appropriate application will open up.
You can also configure Internet Config to recognize Hotline URLs, for example <hotline://hlserver.com/>. To configure, open Internet Config, click on Helpers, then Add, enter "hotline", then click "Choose Helper" and select the Hotline client application.
If you don't have Internet Config, you can download it from any info-mac mirror, or at:
ftp://ftp.share.com/pub/internet-configuration/
Unfortunately, Netscape doesn't use Internet Config. However, it can still be configured to support Hotline URLs, and the included AppleScript will do just that. Just double-click the script and let it do its stuff. Note that you only have to run this script once ╤ not every time you want to use Netscape.
