Job switch 4

If job switch 4 is set before EDT is loaded then, after loading, the messages of the dynamic binder loader (BLS05xx), the EDT start message in L mode (EDT0001) and, on EDT termination, the message

% EDT8000 EDT TERMINATED

are not output. The following messages are also not issued:

%  EDT0900 EDITED FILE(S) NOT SAVED!
%  EDT0904 TERMINATE EDT? REPLY (Y=YES; N=NO)?

If job switch 4 is set before EDT is loaded in batch mode then @LOG NONE is set, i.e. no logging is performed during the EDT session.