IBM 990 User Manual
Page 165
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Chapter 6. Software support
153
The alternative is to be prepared for the boxed CTCs to occur during the next POR of the
upgraded system. In most cases, using the UNCOND option of the VARY ONLINE command
will un-box the CTCs in a nondisruptive manner.
The implications of boxed CTCs, particularly on ISV products, should be investigated during
the planning process prior to a concurrent upgrade.
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