Thank you, but I think it safest I leave modifying the programme to IMSI or the real experts among its users!
In fact I did try deleting a 'CTRL+ key' file whose loss I judged the least damaging, but the table presented on the screen is not editable. Nor of course can I add further short-cut keys.
Since posting that I experimented, since I have two accounts with different e-post addresses on the same computer, but I had loaded TurboCAD from one CD and I think on only one account, but it is still accessible from the other. I have not tried it on my XP computer, but that has no Internet link.
One a/c lets me view the .pdf features-index but not the video or Forum. This is the same a/c which turned the TAB key off. I can reach this Forum only via the Internet directly, outside of TurboCAD.
On the other account, the TAB key and the video work, but the on-line pdf file material is blocked.
The video didn't get me started because it is too fast - I can't learn from a disembodied commentary on an arrow driven by a poltergeist, some steps ahead of the one I am still trying to remember.
So my own difficulty in trying learn undeniably extremely complicated software, is compounded by unknown computer problems, and by what "Help" material I can reach, not "Helping" me. This also means there is no guarantee any suggested solutions will solve anything.