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==PTF installation==
{{unsourced section|date=August 2021}}
{{expand section|Maintenance vehicles for other platforms|talk=Service cycle|date=August 2021}}
Initially, installations had to install service via a manual process. Over time, IBM started to provide tools to automate the installation of batches of PTFs. For [[OS/360 and successors]], this culminated in System Modification Program (SMP) and [[System Modification Program/Extended]] (SMP/E).
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