- Persistent values of $PreInitialization are typically set with InitializationValue[$PreInitialization]=Hold[expr].
- Values defined in different persistence locations on $PersistencePath are joined with Flatten.
- Since $PreInitialization is used early in the startup of a Wolfram Language session, not all capabilities will already be initialized. For example, remote access such as of the cloud from the desktop will not yet be available.
Introduced in 2017