In Shortz et al. v. Farrell, 327 Pa. 81, 85, 193 A. 20, 21 (1937), our Pennsylvania Supreme Court outlined three broad categories of activities that constitute the practice of law: (1) the instruction and advising of clients in regard to the law so that they may pursue their affairs and be informed as to their rights and obligations; (2) the preparation of documents for clients requiring familiarity with legal principles beyond the ken of ordinary laypersons; (3) the appearance on behalf of clients before public tribunals, the application of rules of evidence, the examination and cross-examination of witnesses, and presentation of arguments in order to assist the deciding official in the proper interpretation and enforcement of the law. Shortz, 327 Pa. at 84-85; 193 A. at 21.