Downloadable computer software for use in comparing documents, files, databases, or datasets, and finding differences between documents, files, databases, or datasets, and displaying differences between documents, files, databases or datasets, and generating reports on differences between documents, files, databases or datasets, and merging changes between documents, files, databases or datasets; downloadable computer software for use in comparing sets of documents, files, databases, or datasets, and finding differences between sets of documents, files, databases or datasets, and displaying differences between sets of documents, files, databases or datasets, and generating reports on differences between sets of documents, files, databases, or datasets, and merging changes between sets of documents, files, databases, or datasets