yes it is possible and quite easy to do.  see the pptp document at 
http://m0n0.ch/wall/docbook/pptp.html

James Baber wrote:

>Hello,
>
>I want to configure my W2K/XP laptop to use a VPN tunnel (IPSec) to my
>m0n0wall (with Soekris VPN1401 & NetGate 802.11B Prism 2.5)
>specifically over the wireless network.  Actually I would like to
>configure all my wireless devices to do this.
>
>Is this possible?  If so, can someone point me to an archived document
>with instructions?  I can't seem to find exactly what I'm looking for,
>nor can I seem to get it to work.
>
>Thanks,
>James
>
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