• 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 DEFAULT transport class automatically. In this case, because the group NEWAPP is assigned to a transport class, UNDESIG refers to all groups except NEWAPP.