Normally a subsystem contains some documentation and licensing terms & conditions. For further informations review the sourcecodes folders.
The compiler core.
The macro system
The virtual machine
Language support, translations of compiler messages to different supported languages
The runtime library, contains several libraries which can be used to build applications.
The Replaceable Database Driver Subsystem, contains different database drivers in clipper RDD compatible style.
The Debug system
Codepages for different languages
Common files, shared use by several subsystems