Difference between session and o_session

Hi All,

Please can you explain difference between session and o_session in ADE.

Ex :

winid = hiGetCurrentWindow()

winid~>sevSession

**************** Return Value : sevSession6

and

asiGetSession(hiGetCurrentWindow()) 

 ************* Return Value : stdobj@0x184c0b94

Both these values belong to the ADE session.  In some of the function session values in input and other especially asi* fucntions o_session in the input. Please can you elaborate on the difference?

Regards,

Shrikant