Warning message when 'Taking Over' a PC

Would it be possible to have the facility to automatically display a message briefly on the end user’s computer before we take control? This should be a feature we can enable/disable per customer/device.

For example, if I am on the phone to a client, as I connect to their PC, I generally ask them to save/close any files and databases before I take control.

It’s possible to send a custom message through ITSM procedures. In procedures you can write as the example procedure which you can find here; https://forum.mspconsortium.com/forum/script-library/6241-send-custom-popup-message-to-endpoint and write your custom messages. The user will see a pop up of your message on their screen and will be notofied accordingly.
Kind Regards.