The second step provided a solution for an otherwise tricky problem. Clearly they couldn't tell their man at the R&D Center to send the file to an address such as, say, warren@rms.ca.edu . The ".edu" domain would be a dead giveaway, since any half-awake computer guy would recognize it as the address of a school, immediately blowing the whole operation. To avoid this, they went into Windows on the instructors computer and looked up the machine's IP address, which they would give as the address for sending the file.