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z/OS implements a link pack area (LPA) that consists of a large number of programs preloaded into a virtual storage area available to all address spaces. The pageable link pack area (PLPA) is loaded when z/OS is initially started with what is referred to as a cold start. A cold start is performed when the computer operator selects the create link pack area (CLPA) option at IPL time. PLPA, with the fixed and modified link pack area (FLPA and MLPA) files, forms a high‑speed, memory‑resident library system for z/OS. LPA‑resident modules can be fetched without accessing the program library files.
You can control most z/OS options and parameters from the system parameter library (also known as the logical Parmlib). During IPL, z/OS reads the logical Parmlib, and depending on what is specified, z/OS can prompt the computer operator for additional information. It is possible to restrict much of what the operator is permitted to specify or change.
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