Interact with HTML pages?

Construct 2 is good at the core game canvas, but not so good at lobbies, login sessions, info screens, help screens etc.

What I am wondering is this:

1. Is it possible to "call" a URL/HTML Page from within the game, such that on that page, if they hit a "return to game" type HTML5 button, they can get back to the game (ideally the game will pause, but I guess that's not possible)

2. If you imaging a lobby of game rooms, showing the number of players etc, I would do this using a server driven HTML5 page. I would then want to be able to click on a page, and launch the game. When the game is finished, it should go back to that page.

Is there any way to do this kind of stuff?

You can use the 'Execute JavaScript' action in the browser object. For more complicated bespoke functionality I'd recommend writing a plugin.

Pausing the game whilst a modal appears is perfectly possible.

Bare in mind that wrappers like CocoonJS are DOM-less so HTML won't work when using them.