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==PTF installation==
{{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).
==PTF usage==
{{expand section|Maintenance vehicles for other platforms, alternate methodologies|talk=Service cycle|date=August 2021}}
PTFs used to be distributed in a group on a so-called ''Program Update Tape'' (''PUT'') or ''Recommended Service Upgrade'' (''RSU''), approximately on a monthly basis. They can now be downloaded straight to the system through a direct connection to IBM support. In some instances IBM will release a "Cumulative PTF Pack", a large number of fixes which function best as a whole, and are sometimes codependent. When this happens, IBM issues compact discs containing the entire PTF pack, which can be loaded directly onto the system from its media drive.
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