JTF TASK B

I have some questions that I hope someone can help answer for me. I need some information on a table called JTF_TASKS_B, what I need to know is:

When updates are made to this table there is an column called LAST_UPDATE_DATE, which is course updated, how is this olumn updated? Is it through the PROMISE app? Also, what fields would trigger this column to update? Is it all of the columns in the table?

Thanks,

Sudipto