The attached tarball can be used as a stub Horde application with HEAD versions of Horde (3.2 and later) to map xml-rpc calls that expect phpgw's API into Horde.
Just install the application and feel free to read your calendar with any eGroupware compatible calendar application.
Each xmlrpc request using a phpgw unique name is implemented by this module mapping it into horde registry commands.
A lot of data is stored in the horde datatree, to map kronolith calendar ids into numeric phpgw one's.