Well, you can!
The most common use of a specific power of attorney involves real estate closings. A seller of a property who is leaving the area may not wish to return to the area simply for the purpose of signing the final paperwork. In fact, returning for that one event often does not make good sense financially. In this case, the seller is able to give a power of attorney to his/her agent. The agent can be a trusted friend, family member, lawyer, or other professional and will attend the closing for the seller.