ROB, I meant the overall issur muktzeh itself, and the issur of using an umbrella (which even if ohel would be a d’rabbanon, not an av melacha or toldah), which according to the Ch”I is not ohel, but zilzul Shabbos.
Sam, how could one “quietly” allow an activity which is done outside?
Also ??? ?????? quotes ???? ???? about someone who was ????:
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http://hebrewbooks.org/pdfpager.aspx?req=14506&st=&pgnum=155