1. A method for client-side cross-domain communication of a browser application executing on a client computing device, wherein said browser application comprises a parent host window retrieving internet game operator specific first content from an internet game operators first domain, wherein said internet game operator specific first content comprises an inner window Markup Language element retrieving internet game provider second content from an internet game providers second domain, the method comprising: determining that a game related event has occurred when processing said internet game providers second content in said inner window; sending an game event signal as game event data indicative of said determined game related event data from said inner window to said parent host window.