VPN Access

We currently use VPN access provided by netgear for remote connections (Laptops, Home PC’s) to connect to our LAN,
We have purchsed some Pocket PC’s and we would like to access the LAN via these,
I can get a connection to the internet via GPRS on my mobile but I cannot get VPN access, does anyone know how to set VPN up on these?

Kind Regards

Tim