c# - Changing Web.Config in ISAPI folder -

i need give access account on our production server's being used clients @ momemnt.

would cause trouble if add user web.config or need downtime ?

also changing web.config in isapi (web services) folder requires iis reset or application pool reset ?

no restart required, iis automatically detect web.config file has change , trigger app pool recycle , read new values. clear session , cache variables though affect logged in people etc...