> Question 1: In the above, is the "cd <project>" required or
> can the command "gtags -f <file> <db directory>" be issued from any directory?
> With version 6.2.11, gtags failed without the "cd"; I can try with 6.3 on Monday.
"cd <project>" is required.
> Question 2: how will global know where the data-base is for each gvim?
Usually, it exists in the project root directory.
Why don't you invoke gtags simply as follows?
$ cd <project>
$ gtags