The INS keeps the arrival portion. The departure portion is stapled to the passport. The I-94 shows the visa classification, the date of entry and the length of the stay authorized. This would include any payments made to a third party, such as an airline or hotel. The alien must complete a tax return to try to recover these amounts.
Any alien receiving a payment from the university is required to have an identification number.
It does not matter if the NRA is receiving a reimbursement for travel expenses or some type of honorarium. Even those who complete a Form 8233 and apply for a tax treaty exemption are required to have an identification number. The Form 8233 asks for the identification number in Part 1 of the form. If the alien is eligible to work in the United States, the law requires that the NRA have a social security number for identification. Application for a social security number is done on Form SS-5, which is filed with the Social Security Office.