I would like to use TiddlyWiki as a control center:

When clicking the login link in the second row of the table, the date in the column next to it should be updated.
I can format the link as a button with the link as the label and I can create a formatted date with a macro call.
✅ But how can I address the date in the next column of the table in the same row from the login button?
✅ Can I determine in the button in which browser the tiddler is displayed?
The last line is about "TOR" to indicate that the link should only be clicked in a Tor browser.
If the link is not clicked in a Tor browser, a message should be displayed instead of opening the link.
❓ For the Tor Browser, there is another TiddlyWiki, which also contains this tiddler. But I want to edit/update the content only in one place.
Can the Tor Browser tiddler be changed automatically with changes in the control center TiddlyWiki?
Regards
Cd.K