how to access a web service using AT commands

Hi friends…

i trying to write a sample application which would communicate a webservice through my gprs modem (Sparkfuns EVK v3 usb with GM862 telit module) through a set of AT commands.

i am new to all these stuff. i have no an idea which way try to do solve it.

Firstly i am using windows XP .when i connected this modem to my pc ,i got com3 port by start->programme->accessories–>communication–>Hyperterminal.

On clicking hyperterminal got properties dialog where i found com3 on combo box .Before that it was not thr when the device is not connected.

i want to know how can i write the AT commands in comport which will interact the web service and the AT command codes.My webservice has global IP ADDres.

Plz friends help me on this issue