Can I ask applicants where else they are applying and how they plan to rank programs?

No. The Match Participation Agreement states that applicants are free at all times to keep confidential the names or identities of programs to which they have or may apply. A program director may not request the names, specialties, geographic location, or other identifying information about programs to which an applicant has or may apply. Programs that ask that information of applicants may be subject to a violation investigation.