. "P. 14 (a) (1) (C), 378 Mass. 874 (1979). [Note 21] Rule 17 (a) (2) of the Massachusetts Rules of Criminal Procedure, 378 Mass. 885 (1979), generally controls when summonses may be issued for attendance of witnesses and may also command that the person to whom the summons is directed produce designated books, papers, documents or other objects." . . . .