tuning kernel parameters

Can only root do this, or can other users too? if other users can, do they have to be given permission, and if so, is there a file or something that stores this?

Thanks.

which os? some more informations are always usefull!

it was more of a generic question! But my OS is HP-UX

The various versions of Unix vary quite a bit with something like kernel tuning. And even with HP-UX, the tools are evolving rather fast as HP moves toward dynamic reconfiguration. In general though, kernel tuning is reserved to root. Non-root users can be given access to root level commands via a tool like sudo. And prebuilt versions of sudo are available for HP-UX.

Thanks for your reply