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Hello,
all the functions you mention operate on entire array. 
If you want to access a specific element of an array use subscribt 
operators.
C[0] will give you the value of close for the first bar.
dn=DateNum(); 
first=dn[0];   returns first datenum.
Johan
--- In amibroker@xxxxxxxxxxxxxxx, "mmqp" <mmqp@xxxx> wrote:
> Hi,
> 
> I want to reference to absolute bars/date; another word reference 
to 
> the left most bar available in the database.  It seems to me that 
> Barindex() and cum() only gives you the visible bars.  Can someone 
> give example of function use?
> 
> Also does DateNum() only works for visible bars?
> 
> TIA
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