One instance; Run at startup; Save the input data

[Lykurg]

- use autostart
- see QSettings and encrypt your password (QCA e.g.)
- see Qt Solutions there is an example of an application which could only be started once.

[Pufo]

As far as i can see, autostart works only on Symbian.
I will try to put a script in /etc/init.d for Linux, but i still don't know how to do it for Windows.

Thanks for your reply