Cgi-like plugins. Make your applications and plugins! Besides с++ you can use Python, Perl! I suppose other languages too. Examples included.
Network requests are blocked for security. You can make plugin for this.
0.0.5 - Debug info removed. Added TiddlyWiki example.
0.0.7 - File location changed. This allows use one set for different HTML projects. jsCoreMessage deleted. Another way of handling the close event is used.
You can check files for viruses on virustotal.com.