Conference chairs: Gustaf Neumann and Stefan Sobernig (WU Vienna), Harald Oehlmann (ELMICRON). Organisation committee: Antonio Pisano, Stefan Sobernig and Markus Moser (WU Vienna), Bernd Simon (Knowledge Markets).

The site's own summary, after the fact:

The joint OpenACS and Tcl/Tk Conference 2026 was again a great success and an
inspiring get-together. This event combined the 10th OpenACS conference and
the 22nd European Tcl/Tk Users Meeting (EuroTcl). Thank you to all
participants and to all presenters this year!

Single track throughout, in one room. Titles and presenter surnames are as printed; the site gives no abstracts and no affiliations for presenters.

Three of thirty sessions are panels, and two of those ask the same question in two halves: State and Future of Tcl, then State and Future of Tk. A community that schedules an hour to ask what its language is for is not growing quickly, and knows it.

Everything else reads as a working stack rather than a museum. NaviServer 5.1 and "New Uses of NaviServer 5" are current releases. Next Scripting Framework 2.5 is declared ready for Tcl 9. The mobile ports — iOS and AndroWish — get a progress report and a separate iWish talk, which is a live portability effort rather than maintenance.

Two talks are worth pulling out for reasons this corpus cares about.

"ADP — the NaviServer Web Anti-Framework" (Lehner). The framing is deliberate: ADP is templating that predates the framework era and declines to become one. Worth reading against the current direction of travel, where "framework" is the default unit of web work.

"My own Markdown: using AI to write and extend the Markdown standard in pure Tcl" (Buckman). The one AI talk in thirty sessions, and it is a model writing a parser in a language with a small training corpus — which is the condition under which coding assistants are known to be weakest. The same problem appears for any language whose training corpus is thin, which is the condition under which every recommendation about agent tooling for Lisps is made.

The conference page is served by OpenACS 5.9.2d1 on NaviServer 4.99.33, which is the stack the conference is about. Two observations follow from trying to read it.

It cannot be fetched without cookies. The URL answers a self-referential 302 to itself until a session cookie (ad_session_id, ad_locale) is accepted, at which point the second request returns the page. Any tool that does not persist cookies sees an infinite redirect and reports the site as broken. That is worth knowing before concluding a page is down.

Registration and abstract submission sit behind a login. Both resolve to the same gated URL, which is why the fee is not recoverable — it is not withheld, it is simply inside an account.

The companion site eurotcl.eu carries stub pages for registration, programme, travel and accommodation, each of which redirects the reader back to the conference page. Its archive of past editions, with slide PDFs going back twenty-one meetings, is the more durable artifact.

Recorded because absence is informative: registration fee, timezone, whether any part was hybrid or streamed, session abstracts, presenter affiliations, presenter first names apart from one, slides or proceedings for 2026, attendee count, sponsors.

No slides are published on the conference page, eurotcl.eu or openacs.org, and openacs.org/conf2026/ returns 404, so the microsite that carried them in 2024 was not made this year. Recordings are another matter — see below.

Twenty-six sessions were recorded and published, publicly, at learn.wu.ac.at/eurotcl2026/lecturecasts/ — HTTP 200, no credentials, audio download offered per item, uploaded 2026-07-20 and 21, days after the conference closed.

The count took two attempts. The listing paginates at twenty, and a first pass that fetched only the default page reported twenty as the total. Six more sit at ?page=2. A count taken from one page of a paginated list is a count of that page.

None of the three sites a reader would actually check — the conference page, eurotcl.eu, openacs.org — links to them. The recordings live on the university's teaching platform, which is a sensible place to put them and an unlikely place to look. An earlier draft of this note recorded the materials as unpublished on exactly that evidence, and was wrong.

Most of the programme is a talk about a specific piece of software. Where it lives, and under what terms:

• Conference page (primary; also the site root)
• EuroTcl 2026 and its archive of twenty-one prior meetings
• OpenACS announcement
• Tcl/Tk conferences index