Using the Extended Submit Facility (ESF)
ESF mode is invoked when an active IBM® Connect:Direct® DTF session fails or when session establishment fails. In order for Connect:Direct for z/OS® to activate ESF, you must install the ESF option on the local DTF and you must enable the option in the configuration file.
The user must also include the parameter ESF=YES in the SIGNON command. In ESF mode, a node is available for use only for SUBMIT commands which the user writes directly to the local DTF TCQ file. ESF SUBMIT requests can be issued only by those users who specify ESF as a profile (signon defaults) option.