International registrants should be particularly aware and careful about visa requirements, and should plan travel well in advance. The visa regulations in Austria can be found on the website of the Federal Ministry Republic of Austria.

The Association for Computing Machinery does not issue formal invitation letters for visas to attend ACM sponsored conferences. ACM can however issue a visa support letter.

For Visa support letters, refer all requests to supportletters@acm.org with the following information:

1. Your name as it appears on your passport and mailing address
2. The name of the conference you wish to attend – CCS 2016
3. Your Registration Confirmation Number
4. A fax number or email address of where the letter can be sent
5. If you have any papers accepted for the conference, please provide the title and indicate whether you are the “sole author” or a “co- author”

Please allow up to 10 business days to receive it – requests are handled in the order they are received.