The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.
One of a set of tools we're offering as a way of saying thank you for being a part of the community.
Open an explorer window, from the menu bar Organise, then Folder and Search Options and on the general tab there is the option for double or single click to open files.
I don't know about group policy setings, this is just on a single machine running 2008R2.