| Flow of the communication User/DA authenticate with the AOS, and obtain a session id (refer as SID).
SID has the following format:
SIDxxxxxxxxxxxxxxxxxx
Where "SID" is the prefix of the string, and irregular pattern text of the rest of the string. Length of the SID may be 19 to 21 characters. Eg:
SID78889x23736345h80
SID54545k22545235i54 SID will then be used as a reference to the active user/DA. It is like Cookie for browser, just that SID concept was developed and works well on browser that incapable or diabled on Cookie support. | 
