Getting past APN login on GPRS

Hi to anyone that can help.

i need to get to a TCP/IP server at a known IP address using the GPRS shield.
In the past (with other modems) i have always proceeded as:
set up the context & profile with AT+CGDCONT=“IP”,“internet”,
then get to the APN with ATD99**1#
then others would deal with an authentication phase and link control phase

looking now with the GPRS shield documentation i do not see any mention of logging on to the APN and dealing with the problem of authentication & link controls.

where can i find information or source code on how to deal with that?

thanks in advance

hi,which version of GPRS you have it now?