The plc directory contians  Program Control Logic generated in-house for LCLS.

The following directories can be found under /afs/slac/g/lcls/plc:

pps
vacuum

Each subystem directory must contain a README file that includes the following information:

1) A list and description of all subdirectories and files within those directories
2) How to build a runnable version of the software, This might include
   information on 
     cross-compilers used and the version
     third-party software needed and the versions used, location of these tools
     firmware version required for this software if applicable
     processor or platform the code or loadable image was generated on 
     location of all system and other files needed to build
     node or standalone computer used to perform the build
3)   Location of documentation if not CVS'ed