1) The listeners must have intent to be included in this blessing, they must answer ''Amen'' to the blessing and they must eat from one of the two loaves in order to fulfill their obligation. 2) This is an expression of modesty and also serves to get the attention of the listeners. 3) The piece should be placed before them but not directly into their hands (Shulchan Aruch O.Ch 167:18).

1) This is referring to the obligation of reading the weekly Torah portion twice in Hebrew and once with a translation (Shnayim Mikra VeEchad Targum). This obligation is discussed at length in Chapter 72, Law 11. The Mishna Berurah 285:9 adds that one should not delay the Shabbat meal until after ''Chatzot'' (Halachic Midday) on account of this Mitzvah nor should one delay the meal if there are others waiting to eat. He goes on to say that if one has not fulfilled one's obligation by the time Shabbat commences, one should get up early on Shabbat morning and complete one's reading before going to Synagogue.

אם לא קרא הפרשה בערב שבת לא יאכל שבת בשחרית עד שיקראה ואם לא קראה קודם האכילה יקרא על כל פנים קודם מנחה ובדיעבד עד סוף יום שלישי

1) ''Chatzot'' or six seasonal hours into the day. Each seasonal hour is equal to one twelfth of the time from sunrise to sunset (or dawn to dark, according to others). Obviously, if one made Kiddush and ate a snack before or after the additional prayers, one may delay the main meal until after Chatzot.