...
View a collection's data by clicking on its corresponding icon in the tree on the lefthand side of the LCSim Event Viewer.
Monte Carlo Particles
Open the MCParticleTree by clicking on it in the lefthand, event tree menu.
This shows the tree-like hierarchy of Monte Carlo Particles (MCParticles) in the event. A particles "children" can be viewed by expanding it using the "+" button.
Calorimeter Hit Collections
Select EcalBarrHits from the lefthand, event tree menu.
This view shows one record for each hit in the "EcalBarrHits" collection. These hits are objects of type SimCalorimeterHit. All of the Calorimeter hit collections (including both endcaps and barrels) are decoded in an identical fashion, so the Hcal and Muon collections will look quite similar.
...