Huygens help browser
The Huygens help browser is a built-in HTML interpreter included in the Huygens Software since late 2006 to provide access to plenty of support wiki articles related with the usage of the programs.
You can find help links from the Task info pannel in the Huygens Essential.
In the Huygens Professional you can find Help on function on every pannel of the Operations Window. Both in the Pro and in Huygens Scripting you can always type, after the Tcl Shell prompt, a help query like
help cmle
or
help numerical aperture
to open the help browser.