Aviod Putting Url-information

We have two applications for one system. The first application is a vb-app
and the second is a web-app.

From the vb-app users have the possibility to enter right into the web-app.
The vb-app is creating an appropriate url and opens the web-browser with
this. The url contains user-information like user name and password. We
don't want this url-information to be stored in the history-list, because
then advanced users can find passwords etc here and that's not so good.