+##parameters=key, value=None, default=None
+sd = context.session_data_manager.getSessionData(create = 1)
+if value is None :
+ sVar = sd.get(key, None)
+ if sVar is None and default is not None :
+ sVar = default
+else :
+ sVar = value
+
+sd[key] = sVar
+return sVar