MServer is a simple, lightweight web server for testing HTML5 apps, and is located in the Monkey 'bin' directory.
MServer is automatically used by Trans (and therefore Ted) when you 'run' an html5 app, so you don't normally need to worry about it.
However, if you want to manually run an HTML5 app yourself you can use MServer directly, eg:
bin
\
mserver_winnt
test.html
...for Windows, or for MacOS...
bin
/
mserver_macos
test.html
Mserver will run the given html file using the default OS browser.