HyTelnet

Key takeaways

HyTelnet belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HyTelnet to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HyTelnet from memory before moving on to harder problems.

Reference excerpt

HyTelnet (sometimes rendered Hytelnet or HYTELNET) was an early attempt to create a universal database for the various Telnet-based information resources available before the World Wide Web. It was first developed in 1990 by Peter Scott, then at the University of Saskatchewan in Saskatoon, Canada. Using a client written by Earl Fogel, HyTelnet offered its users a primitive terminal-based GUI that allowed them to browse a directory of Telnet-based resources and then access them in a relatively standardized manner. On-line help was available, and there were frequent updates made available to its database which sites could download. HyTelnet's chief inadequacy was that it was not centralized, i.e., every HyTelnet installation used its own separate copy of the master directory. While beneficial early-on, as it ensured no dependence on a central server, HyTelnet's user experience could vary widely as local installations might not have the same version of the client or might have obsolete information. This became a greater liability as more institutions had reliable, "always-on" Internet access. Finally, when the World Wide Web gained pre-eminence, many of the services that HyTelnet pointed to were gradually retired, increasingly limiting its relevance. HyTelnet's final database update was in 1997.

Interface This is a typical HyTelnet screen running much as a user would have experienced it, rendered in non-proportional font to simulate a terminal. This is from one of the last releases of the client, which was version 6.9.

Welcome to HYTELNET version 6.9 Original version dated June 11, 1995 with updated database as of June 8, 1997

What is HYTELNET? <WHATIS> Library catalogs <SITES1> Other resources <SITES2> Help files for catalogs <OP000> Catalog interfaces <SYS000> Internet Glossary <GLOSSARY> Telnet tips <TELNET> Telnet/TN3270 escape keys <ESCAPE.KEY> Key-stroke commands <HELP>

............................................................. Up/Down arrows MOVE Left/Right arrows SELECT ? for HELP anytime

m returns here i searches the index q quits .............................................................

HYTELNET 6.9 was written by Peter Scott (scott@lights.com) Northern Lights Internet Solutions, Saskatoon, Sask, Canada

Items in angle brackets < > are selectable, and can be highlighted by using the cursor motion keys. There is a prominent online help option. The right arrow/cursor key selects the highlighted option, or ENTER/RETURN. The left key allows users to back up to an earlier level. The search option allows a simple search of a central INDEX file. This INDEX file is one-line-per-resource, and is a flat file that the Hytelnet client searches directly. After entering a term, the client returns a new menu with the list of selectable items, for example this query "library":

<SITES1> On-Line Library Catalogs <PL008> National Library of Poland (Biblioteka Narodawa) <HU007> Hungarian National Library <BE004> Faculty of Agriculture Library - Gembloux <BE010> Royal Library Albert I (Belgium) <TW004> National Central Library <TW013> Taiwan Provincial Library at Taichung <DK001> Danish National Library of Science and Medicine <DK002> Royal Danish Library <DK007> Denmark's Technical Library <DK012> Danish Veterinary and Agricultural Library (AGROLINE) <IT009> Vatican Library (Biblioteca Apostolica Vaticana) <US200> Washington University in St. Louis Medical Library <US202> Waterways Online Library Facilities <US215> New York State Library <US227> University of Texas at Austin Tarlton Law Library (TALLONS) <US229> Boston Library Consortium Union List of Serials <US251> University of California Northern Regional Library Facility <US256> University of Miami Medical Library <US258> OhioLink: Ohio Library and Information Network <US266> University of Virginia Health Sciences Library <US268> Abilene Library Consortium (Texas) <US285> University of Alabama, Birmingham, Lister Hill Health Sciences Library—press space for more --

The user may then select one of these options, or go back with the left arrow. Search results will vary based on the locally installed database. After drilling down to a specific resource, HyTelnet will display a connect page. The hostname, IP address and contact address are for example purposes only, and may not necessarily connect to anything functional (although this is a real entry in HyTelnet's last released database).

University of California (MELVYL)

telnet melvyl.ucop.edu or 192.35.222.222 When asked for terminal type, enter VT100 or HELP for other options Press RETURN when prompted to

To exit, type END

Contact:

preferred address: MELVYL System User Services melvyl@dla.ucop.edu

At this point, the user could select the "telnet" portion and attempt to connect to the remote host over Telnet. Instructions for using the resource are given. Additional instructions for general types of library and research systems were also given in HyTelnet, such as this one for INNOPAC, a common library electronic card cataloguing database:

Using INNOPAC

INNOPAC is very easy to use. Just press the letter or number next to the item that you want. There is no need to press the ENTER or RETURN key when choosing one of the menu options. For example:

Title searches: To search for a particular title, select T on the main menu.

Author searches: To search for a particular author, select A on the main menu.

Subject searches: To search for a particular subject, select S on the main menu.

Keyword searches: Either "k" or "w" (varies from system to system) as listed on the menu.

Other search options: Different INNOPAC libraries have added additional search options, such as Medical Subject Headings, Call Number, SuDocs numbers, Reserve Lists, etc.

Popular options available when looking at any one record include: S > Show items with the SAME SUBJECT Z > Show items nearby on the shelf

The regular updates not only updated the list of resources, but also the help files in addition.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with HyTelnet

Start with the simplest possible case. Write down what HyTelnet claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to HyTelnet before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about HyTelnet ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of HyTelnet

In research: HyTelnet appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses HyTelnet in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: HyTelnet is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-related introductions in 1990, History of the Internet, Telnet, so understanding it makes those chapters shorter.
In everyday life: Look for HyTelnet outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study HyTelnet in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HyTelnet means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain HyTelnet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HyTelnet in simple terms?

HyTelnet (sometimes rendered Hytelnet or HYTELNET) was an early attempt to create a universal database for the various Telnet-based information resources available before the World Wide Web. It was first developed in 1990 by Peter Scott, then at the University of Saskatchewan in Saskatoon, Canada.

Why does HyTelnet matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study HyTelnet?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on HyTelnet.