There may be some requirements for visitors coming to the United States in terms of visas. The visa requirements are described in more detail on the following website: http://travel.state.gov/visa/visa_1750.html

The Association for Information Systems helped interested conference-goers prepare a letter of invitation for attendees requiring visas to travel to the International Conference on Information Systems (ICIS 2009). Information pertaining to forms has been removed since the conference is now past.