JES2 allows the system programmer to add functions or modify processing by writing exits to be executed at certain points during JES2 processing. You can use the $T EXIT(nnn) command to control the invocation, processing, and tracing of JES2 installation exit points. (The nnn subscript defines the exit points affected by this command.) The STATUS parameter specifies whether the exit points are enabled or disabled. The TRACE parameter specifies whether the exit points are traced. The ROUtines parameter associates the list of routines with an exit point to be changed. The REFRESH parameter can change the list of routines associated with an exit point by considering the state of the modules in which the routines reside.