It applies the default output method to the object s, bypassing the installed method for objects of its class.
i1 : s = factor 112 4 o1 = 2 7 o1 : Product
i2 : peek s 4 o2 = Product{2 ,7} o2 : Net
i3 : peek2(s,2) o3 = Product{Power{2,4},Power{7,1}} o3 : Net
See also peek.