• CLASS(TCNEW) - specifies TCNEW as the name of the transport class.
• GROUP(NEWAPP) - assigns group NEWAPP to transport class TCNEW.

  The defaults are taken for CLASSLEN and MAXMSG parameters.

MVS™ defines the transport class DEFAULT automatically. In this case, because the group NEWAPP is assigned to a transport class, UNDESIG refers to all groups except NEWAPP. (The set of all unassigned groups are collectively referred to on the CLASSDEF keyword as UNDESIG).