what does it mean when someone accepts shabbos early, before maariv, and from when does it actually count? if one person accepted shabbos but a fellow jew did not, can the first ask the second to do a melacha, since for the second it is still chol, and does it matter if the second person simply keeps a different minhag of when to accept? and with a non jew, where exactly is the line: a one time request made before shabbos for work that will be done on shabbos day, a standing instruction set up in advance that runs every shabbos, hinting at something instead of asking outright, asking on shabbos for work that will only be done after shabbos, iwork the non jew does partly for his own benefit, and benefiting on shabbos from a melacha a non jew already did on his own?