Originally Posted by egirotto
In the application i have different user level.
One of them is a low privilege user, that can only use this.
To do this, i need that the application stay foreground ever (i know that is a little bit forced, but is the requirement
Blackberry OS does not have support for multiple users. Even if you could solve this problem (which I doubt), the security would be dubious at best.
However if you are required to go down this road, you could keep the device on, at the expense of increase battery usage. Read this article