A sampling of the questions from this book:
1. Is it permitted to send an express letter on Friday, intending that it should arrive on Shabbat?
2. I plan to spend Shabbat in Miami Beach. I do not carry in a thoroughfare frequented by more then 600,000 people, even where there is an eruv. Can i rely lechatchila (to begin with) on the local eruv?
3. I have to invite non-observant guests to a family celebration, and know that if they came they would drive on Shabbat. Am I permitted to invite them under those circumstances?
4. My business is closed on Shabbat. I have a website, however, and non-Jewish or even Jewish customers could access the website on Shabbat and order merchandise using their credit cards. Am I permitted to process their orders after Shabbat?