See 
PublishedAPI for packages intended to be used by Plugin and Contrib authors, or 
browse all packages.
See also 
Developing plugins, 
Developer's Bible, 
Technical Overview
 PROTECTED ObjectMethod checkRCSProgram($prog) → $html 
Specific to RCS, this method checks that the given program is available.
Check is only activated when the selected store implementation is 
RcsWrap.