A "war room" is a term used to denote a centralized location -- a conference room, a tent, a trailer, whatever -- where the organizers of a project can come together and communicate, plan, strategize and share important information about the project.
Today, I was introduced to an online version of the concept at Hall.com. It surprises me that this site has been under the radar, especially with the explosion in use of Google+ Hangouts feature.
A Hall.com war room allows you to have a private environment for all the collaborators associated with a particular project. In each room you will find a get chat, file sharing area, interactive, shared notepad, and integrated, multiuser video chat.
If your staff and/or projects are scattered over a wide geographical area, Hall.com war rooms could be just the tool you need to improve their communication and productivity.