A limited power of attorney (sometimes called a special power of attorney) gives the agent the power to act in the principal's place for a minimal purpose. A Power of Attorney (POA) allows one person to appoint another person to act on their behalf.Create your free general or durable POA today. Grant authority to someone for a specific task. A power of attorney is a document that gives someone legal authority to act for another person. A special power of attorney letter grants another person the authority to act on your behalf, so it's essential to ensure that it's properly drafted. Forms and Downloads. Download the required submittal form. Complete the form and send it with your document to the Secretary of State. The two most common methods for legally assisting an individual in financial matters are through a Power of Attorney or becoming a joint account holder.