How to write watchgod (exe, xp) monitoring the site?

Question

Delphi

On what to write a watchgod that periodically monitors the site. If the site has changed the value to TRUE of this particular client, then the watchdog starts the application. In particular Openvpn with parameters.
If the parameter is missing, then accept FALSE and, as a result, disable openvpn.
The number of Watchdog clients is about 200 PCs.
You can't keep VPN turned on. The channel is just miserable.

Answer 1

On what you master, write on that :-)

Answer 2

I can use delphi, but it seems to me that one component of the tray icon will eat up so much memory. Here also I ask on what the code will be optimized. Not much experience. So I'm wondering which way is easier.

Answer 3

Use exclusively Win32 native API in Delphi....
and without any extra components and libraries!
And you will be happy. (<10Kb should be an exe file)