Hi Mario,

If you need History functionality when working over Internet, you have these
options:
- use VPN connection to the server and then use VSS LAN plugin to access the
database (LAN plugin supports history)
- use 3rd party providers that allows accessing VSS databases over Internet
(see a list at http://alinconstantin.net/webdocs/scc/VSS_Resources.htm);
they don't use VSS Web Service though (they either have their own aspnet
service or proprietary tcp-ip based solutions)

There is no SDK for VSS Web Service (functions are undocumented, as they are
supposed to be used only by the VSS Internet plugin), and there is no
History functionality implemented in the web service side (so you can't
retrieve history information anyway).