Who is Windsor Horne Lockwood III from Fade Away and what is their importance?

Windsor Horne Lockwood III, is Myron's best friend. President of the investment firm Locke-Horn Securities, Win is somewhat of an enigma. Wealthy and intelligent, he looks the part of the aristocratic blue blood, however, he is also a loner, letting very few people into his inner circle of friends. Win is very loyal to those that he considers his friends, Myron being the closest friend he has. The two men had been roommates in college, and have been together ever since. Myron runs his sports agency, and Win runs the family firm, and both have been known to work for the FBI undercover.