gsatya 0 Newbie Poster

Hi friends,
I need to know how the auto responding softwares work. for example if I send keyword IBAL to 567666 I will be receiving my current bank balance through sms. Is it possible to develop such software using vb6? if so I need basics to communicate withe GSM/CDMA modem/Phone to receive and respond to the sms. Pls help

G. Satyanarayanan.