Screen Lock and Trusted system

[GilRAN]

Hello.
I'm using HP-UX 11. The program I run should not run on CDE (it runs on the X server, with MWM, without the dt).
I want to configure an autolock to the screen. That worked using xlock, untill I turned on the Trusted System.
Using Trusted System, the xlock never returns from the screen saver. The Trusted System does not allow it, so it never unlocks.
It seems as if Trusted system and xlock just can't work together.

After looking at some documentation, and talking with HP help desk, I did not find a way to lock the screen (and unlock it...) using Trusted System, without the dt.

Any ideas?
(Maybe there's another screen saver that works with Trusted system besides the CDE lock? Maybe there's a replacement for the HP Trusted system?)

Thanx, GilRAN.