did someone know... how it be possible to do a real time monitoring in WEB Page form?

Actually what i mean is it possible to do a webpage that when the user browse a particular web page... they can get some real time indication (graphics, progress bar etc) for particular system?

For example, an alarm monitoring system... it is possible when the user try to browse the web page and inside the web page they will get a real time indication of the alarm status etc.