We have developed a simple direct execution architecture for a 32 bit Forth microprocessor. The processor can directly access a linear address space of over 4 gigawords. Two instruction types are defined; a subroutine call, and a user defined microcode instruction. On-chip stack caches allow most Forth primitives to execute in a single cycle.

Many authors (1, 2, 3, 5, 6, 7) have suggested that overall performance of a document retrieval system is improved by relevance feedback. Relevance feedback denotes the last three steps in the following process: 1) the searcher enters a query, 2) the system prepares a ranked list of suggested documents, 3) the searcher judges some of the documents for relevancy, 4) the searcher informs the system of these documents judged and of the judgement, 5) the system constructs a new query based on the descriptors used in the original query and the descriptors used in the documents judged, 6) the system prepares a second ranked list of suggested documents.