Guidence needed for Custom Trigger

I have an ADDT Dynamic List and Form. (I love these things!) When I add/edit/delete a record using the form, I would like to update another (unrelated) database table and would like to know if that is possible using a Custom Trigger. I have read Ch. 16 of the ADDT Help manual and am a bit lost with the jargon as I am not a power-php person.
Here is what I need to do: Select from a different table a record by a value in a field and update another field in it. Then return to the Dynamic List page.
The other solution which is an easy cop-out is once the transactions have been completed on the Form page, go to an intermediate PHP script that carries out the Select and Update process then return to the Dynamic List page.
Any suggestions/comments welcome. Thanks.

Hi Albert. Thanks for pointing out yet another hidden gem in ADDT.
The help for this SB is a little vague.
As a result I have no idea on how this will help.
Here is the situation in a bit more detail.
Lets say the Dynamic Form is used to enter News items. These are kept in a table for News Items. These Items are presented on a News page in the site. This page gets its content from the Pages table as well as the News table.
There is no relationship between the two tables. However, the Pages table includes a field called updated which contains the date the "page" was last updated. Each News item also has an Updated field, but when the news item is updated I also want to update the updated field for the News Page.
My first thought was to add a custom trigger to the News Items Form page that could grab the News Page record from the Pages table and update its updated field.
So the Pages Table looks like this:
Table name:pages_pag
Columns:
id_pag - the primary key
idpag_pag - the self foreign key
menulabel_pag - the menu label
template_pag - the template file used to display the page.
pageheading_pag - the page heading
content_pag - the page content
updated_pag - the date created/updated
etc etc......
The News Table looks like this:
Table name: news_nws
Columns:
id_nws
heading_nws
summary_nws
details_nws
updated_nws
etc...
Hope this explains what I am trying to achieve.

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