I have a question regarding the rollup of Opportunities to Account. As well all know Rollup summaries work only on MD relaionships. The relationship between Account and opportunites is a Look-Up relationship. I am able to create a Rollup summary on Account to count no. of opprtunities through this functionality. Dont undertand how this happens. Is Account to Opportunity anything speacial?

hi,

i have set the OWD to public read/write and  profile is read only .  i have a sharing rule ( with read/ write)in which  user A wants to share that record to the another user B (in the same profile) .here i have doubt is whether the second user can edit the records or not.

1)and my secod question is profile over rides the OWD....?