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Overall Grail Architecture
- Asynchronous Protocol API's
- http, ftp, hdl, etc.
- Cache
- avoid redundant transfers
- Asynchronous document reader
- mediates between cache and parser
- handles retries on certain errors
- File Type Parsers
- one each for HTML, plain text, ...
- Viewer (Tk text widget)
- displays formatted text
- Browser (Tk menu bar etc.)
- user interface