How does SerializedProperty iteration work?

I know about IEnumerator and how to iterate over a collection. However I can't figure out how does exaclty work the SerializedProperty iteration. For instance, I' ve made this script to for a custom inspector: using UnityEngine; using System.Collections; using UnityEditor;

 [CustomEditor(typeof(PruebaScript))]
 public class Prueba : Editor
 {
     SerializedProperty a;
     SerializedProperty b;
     SerializedProperty c;
     SerializedProperty d;
     SerializedProperty e;
 
     void OnEnable()
     {
         if(a==null)
             a = serializedObject.FindProperty ("a");
         if(b==null)
             b = serializedObject.FindProperty ("b");
         if(c==null)
             c = serializedObject.FindProperty ("c");
         if(d==null)
             d = serializedObject.FindProperty ("d");
         if(e==null)
             e = serializedObject.FindProperty ("e");
 
     }
     public override void OnInspectorGUI()
     {
         serializedObject.Update ();
         a.floatValue = EditorGUILayout.Slider (a.floatValue, 0.0f, 100f);
         b.floatValue = EditorGUILayout.Slider (b.floatValue, 0.0f, 100f);
         c.floatValue = EditorGUILayout.Slider (c.floatValue, 0.0f, 100f);
         d.floatValue = EditorGUILayout.Slider (d.floatValue, 0.0f, 100f);
         e.floatValue = EditorGUILayout.Slider (e.floatValue, 0.0f, 100f);
         if (GUILayout.Button ("DoSomethingWithIEnumerator")) 
         {
             //
         }
         serializedObject.ApplyModifiedProperties ();
     }
 
 }

This script makes 4 sliders and one button in the "PruebaScript" inspector. However i've not made a list, dictionary , queue or any type of collection to iterate with. So that, how does exactly SerializedProperty's public functions such as Next,NextVisible or Reset work?