The environment variable SIAGHELP can be set to the name of the preferred browser. It defaults to a wrapper which starts Netscape with the help document loaded, but any HTML browser will do. SIAGHELP can be changed from the command line before starting Siag, or in ~/.profile to make the change permanent.
Note that Netscape can't be used without the wrapper, as it behaves differently depending on whether an instance of Netscape is already running.
# Example using Chimera SIAGHELP="chimera" export SIAGHELP # Another example using Lynx in an xterm SIAGHELP="xterm -e lynx" export SIAGHELP # This won't work properly SIAGHELP="netscape" export SIAGHELP(Chimera is a browser written by John Kilburg. Chimera uses the Athena widget set; for this version I have used the Athena 3D widgets, giving it a more modern look.)