prepare to run a callback

History

Time	Change
2014-04-15 03:51:56+00:00	Created
2014-04-15 03:51:56+00:00	Associated with 4866
2016-08-05 14:12:25+00:00	Disassociated from 4866
2016-08-05 14:13:22+00:00	Associated with 27832