grid_mode partitions the screen into a grid and displays each molecule in one grid location. Each molecule rotates, zooms, etc in that grid. A possibly very useful option for PyMOL.
Hint: When using grid_mode with many molecules, it's sometimes good to align their centers of mass. This puts them all squarely in the middle of their grid element. The alignto command from cealign can do this for you.
# turn on grid mode set grid_mode,1 # turn off grid mode set grid_mode,0