The Adobe Flash Media Server family of products is a solution for streaming video and real-time communication.
These are object containers, sometimes known as shared objects. Shared objects allow you to synchronize users and store data. Shared objects can do anything from holding the position of pieces on a game board to broadcasting chat text messages. Shared objects let you keep track of what users are doing in real time.
These shared objects are named with the extension .fso and are stored on the server in a subdirectory of the application that created the shared object. Flash Media Server creates these directories automatically.
Remote shared objects on the client have the file extension .sor and are also stored in a subdirectory of the application that created them.