Starting with version 1.3.17, pressing the [F1] key in the model editor (or selecting Help in the context menu), opens context-sensitive help for the selected element's template. The documentation from our site is displayed if your computer is online, otherwise the built-in help (also accessible via Help -> Help Contents) is used.
Note that currently some of the templates are undocumented or partially documented. We are working on bridging this gap.
For best results, use the Firefox browser..