At this time only source of information is v-q's source. You can look into interfaces/clue, tests, there are also some examples of using v-q from other languages than C++, they are placed in examples directory.
Source code of this application is kept in public Subversion repository located at http://svn.berlios.de/svnroot/repos/v-q . If you want to have R/W access you must be a registered user of berlios.de.