Hi Experts,

I am new to this task at hand. Can somebody guide me on the ff:

1. What hardware components are necessary aside from the PC and the GSM Modem?
2. How does one 'connect' to the GSM Modem? I read that one is supposed to use "AT" commands.
3. My only requirement is for the app to be able to send the client an SMS message everytime his employee clocks in or out of an existing timekeeping app.

Thanks In Advance!