I have compiled a list of some of the more relevant materials that appear over on the main ImmInfo.com site and provided links to them here. To read any of these materials, just click on the link below. If you click on the graphic at the top of each item that comes up, you will be taken to the ImmInfo.com library. Visitors' visas (B-1 and B-2) Inviting your parents for a visit Foreign students (F and M), generally. Visa Office memo on the subject of required intent for F visa applicants. Exchange Visitors (J). Visa Office memo: Validity of student visas subject to a break in studies.