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Three die set: Size & decap, expand and flare, seat and crimp. The "fourth component" in the Midway illustration is an extra bullet seating plug for a different shape bullet nose. Probably one for semiwadcutter, one for roundnose or ogival hollowpoints.
A trim die is used by screwing it into the press like any other die, running a case in, and filing off any brass that sticks out the top. The top of the die is more than file hard so you can cut right down to it. Not needed if you have a rotary trimmer with the right pilot.
Actually the only reason I know to trim handgun brass is to get mixed brass to the same length so it will crimp the same. Pistol brass does not stretch like rifle brass.
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