Question : What does it mean this access query

IIf([T_FPtr_GeneralSearch].[PromoPeriod]="Period",1,IIf([T_FPtr_GeneralSearch].[PromoPeriod]=[T_100_q010_PromoTitleandDetailsAsOne_SELECT].[T_OUTPUT_PromoChosenAtEntry_MAIN].[promo_period],1,0))

Answer : What does it mean this access query

IIf([T_FPtr_GeneralSearch].[PromoPeriod]="Period",1,

IIf([T_FPtr_GeneralSearch].[PromoPeriod]=[T_100_q010_PromoTitleandDetailsAsOne_SELECT].[T_OUTPUT_PromoChosenAtEntry_MAIN].[promo_period],1,0))

if T_FPtr_GeneralSearch].[PromoPeriod]="Period, the value is 1
else if T_FPtr_GeneralSearch].[PromoPeriod]=[T_100_q010_PromoTitleandDetailsAsOne_SELECT].[T_OUTPUT_PromoChosenAtEntry_MAIN].[promo_period]
else the vlaue is 0