6) If one prolongs the Maariv prayer at the end of Shabbos, or if one prolongs his meal into the night, he may ask a Jew, who has already made Havdalah (i.e. over the cup or even just in his own Shemoneh Esrei) to do melacha (forbidden work) for him. Furthermore, he may even benefit or partake of this melacha, even though he will still be reciting ‘R’tzei v’hachalitzeinu’ (i.e. the Shabbos insertion) during his ‘Birkas Hamazon’ (Grace after Meals)!
12) It is a mitzvah to light extra candles on Motzei Shabbos and to recite ‘zemiros’ (special songs) to escort the Shabbos on “her” departure. This is a sign of respect, similar to a king being escorted upon departing a city. Eliyahu HaNavi (Elijah the Prophet) is mentioned as well, and we pray that he come and bring us the tidings of the Redemption. The reason we mention this now is because out tradition states that Eliyahu will not arrive on Erev Shabbos (Friday) so as not to disturb the Jewish People in its preparation for Shabbos. On Shabbos too, we do not pray for his arrival, based upon the following halachic grounds: If the law of the ‘techum’ (Shabbos boundary within which a person may walk) applies above ten ‘tefachim’ (handbreadths), he would not be able to “travel” (i.e. from Heaven down to Earth) on Shabbos! Therefore, as soon as Shabbos is over, when it is possible once again for him to come, we pray that he indeed come to bring us good tidings! Another reason that Eliyahu is mentioned for good at this time is based upon what the Midrash states, namely that at the end of Shabbos, Eliyahu enters ‘Gan Eden’ (the Garden of Eden) and sits under the “Tree of Life”, and inscribes the merits of the Israelites who keep the Shabbos!