The following terms and phrases, when used in this chapter, have the following meanings:(1) Commission--The Texas Real Estate Commission.(2) Contract forms--Contracts and related addenda, including notices, amendments, and other documents, used in the sale, exchange, option, or lease of any interest in real property.(3) Informational item--A statement that completes a blank in a contract form, discloses factual information, or provides instructions.(4) License holder--A real estate broker or sales agent licensed under Chapter 1101, Texas Occupations Code.(5) Mandatory use--Unless an exception applies under subsection (a) of section 537.11 (relating to Use of Standard Contract Forms; Unauthorized Practice of Law), use of the contract form is required by a license holder.(6) Voluntary use--A license holder may, but is not required to, use the contract form.