In OpenExhibits the virtual keyboard component is cloneable in more instances?
Two operators can use at the same time two different virtual keyboard inputing text in two different HTML Exhibit components (web pages)?
Are you referring to the system virtual keyboard or the CML TouchKeyboard element? If the latter, you can declare as may touch keyboards as you desire.
for example I declare 2 CML TouchKeyboards.
Can 2 different users type the keyboards at the same time?
The CML TouchKeyboards is only for typing on flash elements or I can use it on HTML input elements?
Two users can definitely type on two separate keyboards at the same time but it is unknown whether or not HTML elements permit concurrent interaction themselves. The TouchKeyboard is only intended to work with CML objects but it does dispatch application level key events so you may be able to write some custom code to relay the keystrokes to the html text fields. The html element was introduced as a simple solution to display basic html pages and was never tested and evolved beyond that. The source code is available on github for you to experiment with but from my experience, the limitations justify using a more robust system when it comes to building more complex HTML interactives.
If not using Flash is an option, one of our developers has experimented with the WPF bindings for Chormium. You can use manipulate events and make a touch keyboard send key events to the selected browser control.