lang/en_utf8/help/cmidnumber.html

   1 <h1>ID number</h1>
   2 <p>Setting an ID number provides a way of identifying the activity for grade calculation purposes.
   3 If the activity is not included in any grade calculation then the ID number field can be left blank.</p>
   4 <p> The ID number can also be set on the edit grade calculation page in the gradebook, though it can
   5 only be edited on the update activity page.</p>