Manually Trigger Notification of Other User for Object Change

Is there a way to manually trigger another user upon an object change?

Example: I write a note for e.g. a Ticket and want colleague Bob to be informed about this.

In several forum softwares (e.g. Discourse) or issue trackers like JIRA, I can just write "@username" to nudge the user with the "username". It will get a notification message, even if not subscribed to the topic / issue.

In Bugzilla, I can at least subscribe anyone to any issue - maybe not always a desired behaviour, but I can make sure someone I think who needs to be notified actually gets notified.

What's the best way to achieve this in ProjeQtOr?

The "@username" notation probably does not exist in ProjeQtOr.

I can manually send an object as email to someone, but this then includes a summary of everything, not just the current modification or added note. Also I could not find a way to select another user or to have some kind of "user autocompletion", so I have to know the eMail address and enter it manually.

Can I somehow subscribe another user to an object?

Or is there something similar to the "@username" notation (even if it's no keyword in the comment itself) such that the target person gets a notification of the current change / comment?

If you have correponding rights, you can also subscribe for another user.

Ah, just found out about this; good!

just use "other" checkbox to open full text field fore email address (you can alos enter user name in this field for quick search)

I found out about the "other" checkbox an email address field, but in my installation there does not seem to be a quick search function - it just seems to be a plain text field and does not show any popup or similar.