Create a virtual service - How to?

[Mister IT Guru]

We have several systems which all work independently, as does everyone, 
naturally. We also have 'virtual services' which dependent on these 
working. What I'd like to do is set off Alert X, if A, B or C, have a 
problem, as well as A, B, or C, also sending an alert to thier 
respective responsible persons

For example, VPN, Email, RDP, and our custom application need to be on 
line, in order for remote consultants to be able to work. The custom 
app, and email are managed by one team, and VPN and RDP by two other 
separate teams.

This 'service' we can all RC for the sake of argument, and I would like 
an alert from the RC service, if any of the four services it relies on 
goes down, because the teams involved in managing the the separate 
services do it not just for the RC, but for a number of other groups of 
users as well.

How can I achieve this 'virtual service' check I'd like to implement.

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