SITE_SESSION_VARIABLE_MANAGE SITE Endpoint
  /rpc/site/?method=SITE_SESSION_VARIABLE_MANAGE  
  Set a session variable - that will survive document refreshes or other client actions that can't lose state within the client/interface.  
  PARAMETERS TYPE NOTES
  ThisSiteOnly 1 The session variable is only available to the current site - even if sessionid is transferred to another site.
  Variable Text Your name for the variable.
  Value Text  
  RETURN  
  notes UPDATED