When a company agrees to move you or relocate you for a new career, essentially, there are two sets of buyers and two sets of sellers all working in concert to close escrow at the same time.
1) The sellers sell the house to the relocation company (seller and buyer).
2) The relocation company (now is the seller) sells it to the buyers found through the realtors marketing efforts.
3) The buyers have an agent and a transaction perspective as a buyer and often a sale of their house that effects # 1and 2 above (possible 3rd set of buyers and sellers).
It is essential to have an agent with sharp communication skills on the phone, email, fax and even texting. With that many transactions happening at the same time everyone needs to know what is happening and what needs to be done.