The last file to be loaded by the bootstrap process contains module-level code which will trigger the self-initialization of the interactive system--including CM. One job of CM is to manage sharing of link-time state (i.e., dynamic state created by module-level code at link time). Link-time state of a module used by the interactive system should be shared with any program using the same module. The file .boot. arch- os/PIDMAP contains information that enables CM to relate existing link-time state to particular library modules and also to identify any link-time state that will never be shared and which can therefore be dropped. It is CMB's responsibility to construct the PIDMAP file.