What happens when I edit web.config?

Question

I need to edit the web.config file on a live Sharepoint environment, but I\'m unsure what will happen if I do (I want to output custom errors).

Will this cause the I

Answer 1

When you edit the web.config, It will restart the AppDomain (NOT AppPool) of that web application and clears the all occupied resources and memory. So other web applications running under that App Pool will not be affected. Also it will clear the sessions (in-proc) and memory cache.