I need a mechanism similar to
notify-send for sending notifications, but which would be more permanent - I would like the notification to only disappear when the user clicks on it, no sooner.
If user turns off the computer without clicking on the notification, I would like it to still be there on re-booting the system.
I think I am looking for something similar to Windows Actions Center.
Are there any tools to achieve my goal?
If not, what would be the alternatives? Can I, for example, manually add new unread e-mail in my e-mail client?