When our workstations startup right before the PXE boot there is a line
that says "Press F8 for the boot options menu" which counts down from 1.

I'm wondering if there is a way to disable this so that users aren't able
to select whether to boot from the HD or the network.

I know in sys:\system\pdhcp.ini there is a Boot_Menu_Timeout=1 line but
changing it doesn't seem to have any effect.

Is there a way to disable the menu on startup?