According to the rules of ICPP2009 conference registration, we will only issue a letter of invitation after authors have paid their registration fee and made a request for such a letter.Please send the request for a letter of invitation with a copy of the registration receipt to:General co-chair:Professor A Min TjoaDirectorInstitute of Software Technology and Interactive Systems Vienna University of Technology Favoritenstr. 9/188 A1040 Vienna, Austria AMin@ifs.tuwien.ac.atIn the subject line of the email please type: ICPP 2009: Request for Invitation Letter Please be advised that the committee will not act as a guarantor nor issue any documents to guarantee your identity.