JES2 may be either cold started or warm started, depending on the current environment. You can specify the type of start (COLD or WARM) on the MVS™ START command, or in response to the $HASP426 SPECIFY OPTIONS message. (See Specifying the Start Options for information about how to specify JES2 options.) Specifying WARM can result in a hot start or quick start, as described below and summarized in Table 1.