Storing local data
You use the SharedObject class to store small amounts of data on the client computer. In Adobe AIR, you can also use the EncryptedLocalStore class to store small amounts of privacy-sensitive user data on the local computer in an AIR application.
You can also read and write files on the file system and (in Adobe AIR) access local database files. For more information, see Working with the file system and Working with local SQL databases in AIR.
There are a number of security factors that relate to shared objects. For more information, see Shared objects in Security.