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+IMPACT is a port of Levy-Knuth CTangle 3.1 to the Macintosh.
+
+It differs from previous ports in two major ways. First, it
+runs persistently, by which I mean that you can tangle as many
+files as you like, instead of having to restart the application for
+each run. Second, it responds to the 'odoc' Apple Event, so you
+can tangle a file from any other application, for instance, your
+editor, that will send an appropriate Apple Event.
+
+Version 1.1 incorporates some important improvements.
+
+A. An options menu allows control over two features. You can
+specify the file extension used for the output file. For instance,
+I change this to ``.cp'' when generating C++ files. And you can
+instruct Tangle to omit all line and section references. The
+line references seriously confuse the Symantec C++ compiler and
+debugger.
+
+B. Tangle has been revised to create temporary files, rather than
+replacing the previous versions of its output. Impact then compares the
+new versions with the previous ones to see if any changes have been made.
+Only if a file has changed is it replaced. This feature frees a
+writer to include as many output files as he likes in one web file,
+without paying the penalty of unnecessary compilations.
+
+Messageware.
+
+Timothy Larkin
+PO Box 107
+Brooktondale, NY 14817-0107
+607.539.7299
+tsl1@cornell.edu \ No newline at end of file