the ID is auto-assigned and only used to reference which entry to delete.

edit - added following:

found some notes from when I've used it in the past:
started schedule service
at 20:30 /every:m,t,w,th,f e:\\backup\\export.bat

this runs task in a window for debugging
at 9:18 /I e:\\backup\\export.bat /k

If I recall correctly, if the /every option is not used then the task will drop off the scheduler list after it runs. Good for one-time tasks.