[OPEN-ILS-GENERAL] Custom client possible?

[bookworm2010 at xemaps.com]

Is it possible for an end user (i.e. member of the public) to write his own client to query the library catalog instead of using the OPAC? If so what are the related resources (documentation, sample code, forum/email list, etc)? The ideal solution would be a set of js functions for making queries, placing hold, logging in, retrieving patron's record, etc. Thx.