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- What is HotLinks?
-
- HotLinks is Soft-LogikUs data interchange environment. It allows any HotLinks
- aware program to exchange data with any other HotLinks aware program. Although
- the HotLinks interface was developed by Soft-Logik, we are opening it up to the
- whole Amiga community in much the way ARexx or IFF is open the community. In
- fact the data formats used by HotLinks all follow established IFF guidelines.
- What HotLinks offers is a method for documented data interchange via a document
- database and live update.
- Having said that mouth full, what does it all mean. To best answer that, here
- are some of the most asked questions about HotLinks:
-
- Q: Is HotLinks the same as ARexx?
- A: No. HotLinks is designed around the idea of data interchange, not command
- interchange. HotLinks is perfectly suited for exchanging large bitmap files and
- word processing documents. It does not send commands to programs other than to
- let them know the HotLinks edition they have subscribed to has been updated. In
- feel and operation, it is much more like the DOS library than ARexx. Together
- though, ARexx and HotLinks are a powerful team.
-
- Q: Is HotLinks proprietary?
- A: No. We want everyone to use HotLinks and help shape its future. The actual
- HotLinks library, resident code and support programs however are copyrighted by
- Soft-Logik.
-
- Q: Do I have to license HotLinks from Soft-Logik?
- A: No. We are making information about HotLinks freely available. The HotLinks
- resident code itself is a product from Soft-Logik, much like ARexx is a product
- from William Hawes. Currently the HotLinks resident code is sold with two
- HotLinks compatible programs, BME and PageLiner.
-
- Q: What sort of support will Soft-Logik offer, and to whom?
- A: We are interested in supporting all developers who wish to include HotLinks
- in their products. In some ads, we have restricted this to those registered
- with CATS. We do not require this, but would encourage any Amiga developer to
- be registered with Commodore in their native country or region.
- As for the support itself, we will be sending a developers kit to those who
- request it. This kit includes example code in the C language for interacting
- with HotLinks, all associated includes, development tools and a complete set of
- libs and programs that make up the HotLinks environment. It also includes a
- paper manual full of HotLinks programming and development information.
- Soft-Logik also wants to ensure those products that claim to be Hot-Links
- compatible, are. To this end, Soft-Logik asks that those developers that
- integrate HotLinks into their products provide Soft-Logik with two copies of the
- product. This is so Soft-Logik may validate, demonstrate and better answer
- questions about supporting products. Furthermore Soft-Logik intends on
- including lists of HotLinks compatible products in its ads and producing a
- RHotLinks CompatibleS sticker much like the green 2.0 sticker. This is
- necessary to assure users that a program that claims to be HotLinks compatible,
- truly is.
- Q: How does HotLinks compare to similar systems on other platforms?
- A: HotLinks is often compared to systems like DDE and OLE on DOS platforms,
- Publish and Subscribe in Macintosh System 7 and NeXt step 3.0Us Linking.
- HotLinks uses a Publish and Subscribe metaphor, not unlike the Apple Macintosh
- System 7. Also like DDE and System 7, HotLinks uses the operating systemUs
- standard message passing system.
- HotLinks functions are accessed via a disk based library called
- HotLinks.library. The library packages up your messages and sends them to the
- HotLinks resident program, and returns to your program the results. Furthermore
- the library provides a uniform interface, with the new 2.0 look, for all
- HotLinks interaction.
-
- Q: How does the Publish and Subscribe metaphor in HotLinks work?
- A: When you wish to make a block of data available to HotLink users, you Publish
- it. If you make changes to that data and want to give users the new data, you
- Update it. If at any point you no longer want users to receive further changes
- from your document, you can break the link that associates your data with the
- HotLinks Edition. At this point people could still subscribe to the old data
- and update it, unless you delete the Edition.
- If you wish to use the data that HotLinks has to offer, you may Subscribe to an
- Edition. When you Subscribe, you can: (1) link the data and ask for
- notification, (2) link the data and not ask for notification, or (3)receive the
- data and immediately break the link. Each case it has its own uses. In the
- event that you save a file with a HotLink in it, that file will not be updated
- until it is reopened. When a file is reopened, you can check to see if you have
- the most recent version of the Edition. If not, you can update at that time.
-
- Q: How does HotLinks physically interchange the data?
- A: In all cases an actual disk based file is created when data is exchanged.
- This file contains the data as well as security and audit information.
- Currently HotLinks maintains a special directory where HotLinked files are kept.
- Files in the HotLinks directory are not meant to be accessed by the normal OS,
- but can be as they are normal Amiga files. In the future however, files may be
- kept in many places, possibly across networks. By using the calls in the
- HotLinks library, the program does not need to know where the file is physically
- located.
- The files are written by the program, via HotLinks, in much the same manner as
- if using the DOS library. Open, Read, Write, Seek and Close calls all have
- HotLink equivalents. For this reason, implementing HotLinks is very similar to
- implementing traditional file I/O.
-
- Q: What kind of data can be exchanged?
- A: Eventually, everything. At this time, only the formats for bitmapped
- graphics and formatted text have been defined. The bitmapped format is a simple
- extension of the existing IFF ILBM format, and the text format is IFF DTXT. It
- is our intention that wherever possible, any existing approved IFF format will
- be used. In this way, a minimal amount of redevelopment will need to be done.
- Of course many kinds of data that will be exchanged do not yet have an
- established IFF format. We will work with any developer or group of developers
- to establish new standards. This will expand the IFF standard as well as focus
- program data interchange in and out of HotLinks. We also want to include those
- members of the Amiga community that are involved in the BIX amiga.dev/iff
- section, as they have helped shape several standards.
-
- Q: Can you give me an example of how HotLinks is used?
- A: Here are a few examples:
- A user scans in an image using HotLinks aware software. The user has the choice
- of saving the image as a normal file, and/or publishing it to HotLinks. They
- publishes it to HotLinks, then switches into a page layout program. Next, the
- user subscribes to the image, places, rotates and scales the image. After
- having done this they realize that there is a minor problem with the image, not
- enough to require re-scanning, just touch up. The user then enters the touch up
- program and subscribes to the file, touches it up and updates it. Now when they
- flip back to the page layout program the file has updated, but none of the
- position, rotation, scaling information has been lost.
- Another example could involve text. A user may first create a body of text in
- a fast text or word processor, then publish the file to HotLinks. From here the
- file could be grammar checked, flowed into page layout, re-edited, re-checked
- and re-flowed. The document could make many trips around the loop without
- losing any important information. In each case the subscribing program only
- changes the information it understands, and passes on the rest.
- Finally, HotLinks would be an excellent way to update parts of a multi-media
- presentation without disturbing the whole. Each part, text, sounds, animations,
- graphics, could be Hot-Linked editions. The user could work on these while
- maintaining the originals in the presentation. When the user feels that the
- updated version is now better, then they can choose to update that portion. In
- the meantime, the integrity of the whole presentation is maintained.
-
- Q: What do I have to do to support HotLinks?
- A: At its heart, HotLinks merely enhances the file I/O environment. To use a
- HotLinks edition, you will have to do the equivalent of reading and writing a
- standard file. For the most part this means treating HotLinks like another
- format you import or export. The major difference is that you get HotLinks
- edition requesters when asking for an edition instead of the standard ASL or ARP
- requester. There is also an edition information requester available. Depending
- on what options you support, you may want to add a HotLinks menu or sub-menu.
-
- Q: What is in the future for HotLinks?
- A: One of the biggest things in the future of HotLinks is network support. The
- real power of HotLinks can be unleashed when multiple users on a network can be
- collaborating on a single venture, each providing the other with different parts
- of the whole. The current version of HotLinks is not network compatible, but
- due to the multi-tasking nature of the Amiga, it offers a powerful way for
- programs to interact.
- Also we foresee the integration of ARexx, for seamless computer control of the
- whole environment.