ULC has been renamed to Ultra Light Client and the Java version is now available as a product. See UltraLightClientJava for up-to-date information. --RolfPfenninger?
For details on ULCs, see http://www.software.ibm.com/ad/smalltalk/about/ulcfact.html or download a recent presentation by ErichGamma at http://swt-www.informatik.uni-hamburg.de/guests/ULCFolien.pdf --FrankWestphal