Here is a quick, two-key shortcut I created to lock all model viewports in every layout tab. It also zooms extents, so the next time you go to the tab, you see everything. This helps when other users don't zoom out as their standard method of drafting.
Notes from Cadalyst tip reviewer R.K. McSwain: This routine works as advertised, it locks every viewport and performs a zoom, extents in each layout. It's very similar to Cadalyst CAD Tip No. 2129, except this one performs the zoom. Note that viewports on locked layers will not be modified by this routine.