Inverse.Cascade.All.Table

public class StoreMap : ClassMap<Store>
{
  public StoreMap()
  {
    Id(x => x.Id);
    Map(x => x.Name);
    HasMany(x => x.Staff)
      .Inverse()
      .Cascade.All();
    HasManyToMany(x => x.Products)
     .Cascade.All()
     .Table("StoreProduct");
  }
}

You've also just got your first taste of the fluent interface Fluent NHibernate provides. The HasMany method has a second call directly from it's return type (Inverse()), and HasManyToMany has Cascade.All() and Table; this is called method chaining, and it's used to create a more natural language in your configuration.

Inverse on HasMany is an NHibernate term, and it means that the other end of the relationship is responsible for saving.
Cascade.All on HasManyToMany tells NHibernate to cascade events down to the entities in the collection (so when you save the Store, all the Products are saved too).
Table sets the many-to-many join table name.

https://github.com/jagregory/fluent-nhibernate/wiki/Database-configuration