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DOS/4G and DOS/4GW FAQ:
Upgrading DOS/4GW


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  1. Is the version 2.01a update a direct replacement for my version 1.97?
  2. Can we still substitute our own WSTUB.C in version 2.01a?
  3. Can we still freely redistribute our product if we use DOS/4GW 2.01a?
  4. Will my application run faster if I upgrade DOS/4GW from version 1.97 to 2.01?
  5. Will my application run faster if I upgrade from DOS/4GW version 1.97 to DOS/4G for Watcom or full DOS/4G?

1. Is the version 2.01a update a direct replacement for my version 1.97?

Yes. You should be able to just replace your DOS4GW.EXE file with the one in the update, and things will work at least as well as before.


2. Can we still substitute our own WSTUB.C in version 2.01a?

Yes. The file WSTUB.C didn't change between versions 1.97 and 2.01a.


3. Can we still freely redistribute our product if we use DOS/4GW 2.01a?

Your distribution rights don't change as a result of upgrading to the latest version of DOS/4GW, version 2.01a. If you had the right to freely redistribute your product with version 1.97, and most people do, you have exactly the same rights with version 2.01a.

Note that even though DOS/4GW is normally freely distributable, you are required to display our copyright notice at some time during your program's start-up or execution.


4. Will my application run faster if I upgrade DOS/4GW from version 1.97 to 2.01?

No, probably not.

The changes between 1.97 and 2.01 are mostly bug fixes and compatibility improvements.


5. Will my application run faster if I upgrade from DOS/4GW version 1.97 to DOS/4G for Watcom or full DOS/4G?

Not directly.

The main difference between DOS/4GW and DOS/4G is increased functionality.

However, you can allocate more memory with DOS/4G and DOS/4G for Watcom, so if having larger buffers or arrays will help your simulation program run faster, then you may see improved performance.


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Last modified 2003.02.11. Your questions, comments, and feedback are welcome.