Help!!! Alerts in Excel!!

i need help! is it possible to create any alert (pop-up messages, email, etc) in an excel file uploaded in a certain network?

the file contains a specific column of info, which has corresponding due dates and contact person/s. i have to create an alert when a certain date listed in that excel file arrives and send that alert to the person concerned. that contact person is also listed in the file. the alert could be in the form of a pop-up in his specific PC or an automated email alert.

or is there an alternative, such as creating a new program for this. any suggestion would be GREATLY appreciated. im getting pretty desperate. thanks a lot!!!!