What is the program / service for notifying the user in the OS about certain events?

Question

Windows

Good afternoon, please tell me if there is any solution that allows you to do the following.
For example, the intranet (which is built on Active Directory) is full of sites, services, and so on. let's say one of them is an electronic document management system in which users have tasks that may be overdue, and you need to make sure that when the user logs in to Windows, some kind of notification pops up for him, saying that you have so many tasks overdue.
Those. so that this solution can be customized for various purposes, i.e. there was some kind of API, connections to databases, checking values ​​in them, or depending on the role in AD

Answer 1

Zabbix, Nagios, Kakti (look for the correct spelling).
Plus, a lot of products from any major manufacturer - MS, Cisco, HP ...
Or you can simply set up event log monitoring and do something when an event occurs (send email, SMS, display a picture ...)