Config settings are imported from multiple sources: from different files, -from environment variables, from command line arguments, from the .pcb -files on load. Any source can define any part of the config tree. +from environment variables, from command line arguments, from the opened (.pcb +or .lht) files on load. Any source can define any part of the config tree. When the configuration is processed, each source is read into a temporary tree and then all the temporary trees are merged into the final config tree. The following diagram demonstrates all configuration