Download and branch

I have a column link on a report region. The result of clicking the column link should be to execute a procedure that downloads a file then branch to another page in the application.
Despite trying all kinds of permutations of linking, submitting, processing and branching on the report page and the target page I can't achieve the desired behaviour: it will download but not branch, branch but not download, or branch and dump the file contents into the browser window.
I'm sure this is perfectly simple but I've reached the can't see the wood for the trees stage...

I'm still having problems with this. Further searching revealed that htp.init() solves dumping the file contents into the browser window, and I thought that owa_util.redirect_url(...) would help in either acheiving a download and branch or a branch and download...but no. Whether I try to do this through AppEx processes and branches or in server PL/SQL, it either does the download and stays on the original page, or it changes the page and doesn't download the file.
Raj's comments in this thread:
Re: Downloading BLOB from a table.
are kind of hopeful, as they cover our requirement that you must be authenticated/authorised to access the report page (and hence the downloads) but it doesn't cover the scenario of branching back to the report page to show the updated information that the download has occurred.
Is this possible to do this using one browser window? (I've done it using JavaScript to open a new window for the download and redirecting the original.)
I think the steps should be:
1. Update database information on downloads
2. Redisplay the report page showing updated information
3. Branch to URL calling download procedure
but cannot seem to find the appropriate process/branch firing points.
I'd be surprised if no one else has done this, but if no one has anything to contribute on this particular problem, I'd really appreciate explanations (or pointers to explanations) for the workings of htp.init() and wwv_flow.g_unrecoverable_error that are mentioned a lot in forum posts relating to this kind of activity, but are not covered (that I've been able to find) in the Oracle documentation.
[This is HTML DB 1.6.0.00.87 on Oracle9i Enterprise Edition 9.2.0.5.0 through Oracle Application Server 9.0.4.1.0.]

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