What is an installed image?
The term “install” has two distinct meanings in OpenVMS. The first relates to “installing a product”, which is done with either the SYS$UPDATE:VMSINSTAL.COM command procedure or the POLYCENTER Software Installation (PCSI) utility (PRODUCT command). The second meaning relates to the use of the INSTALL utility, which is what concerns us here. The INSTALL utility is used to identify to OpenVMS a specific copy of an image, either executable or shareable, which is to be given some set of enhanced properties. For example, when you issue the SET PASSWORD command, the image SYS$SYSTEM:SETP0.EXE is run. That image needs to have elevated privileges to perform its function. The other important attribute is /SHARED. This means that shareable parts of the image (typically read-only code and data) are loaded into memory only once and are shared among all users on a system. Executable images can be installed /SHARED as well as shareable library images. (The term “shareable” has dual meanings here, to
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