I know I've seen this question asked before, but in reviewing the
archives for an hour or so I couldn't find the question or the answer.

Other than opening MPCORB.dat and manually removing the selected
asteroids, and then doing an Edit Comet Data from Guide itself, is
there some way to prevent the display of asteroids that I've already
observed so that I may more easily spot those that I haven't?

I don't have Mircosoft Access so I don't think that I can touch
the .dat file even if I needed to.

Clear skies,

Pete