HOW TO SET WHO COLUMNS TO FORM and HOW TO SET CALENDAR TO ITEM

how to set who columns?
in form level or item level
open pre-insert ,pre-update,pre-delete triggers
use the following code
fnd_standard.set_who;

(WHO Columns are
last_updated_by number
,last_update_login number
,creation_date date
,created_by number
,last_update_date date)

how to set the calendar to an item?

go to property pallete of an item
lov as enable list lamp
and validate from list as NO
create a trigger key-list-val at item level
use d following code
calendar.show;