Time to read the user guide ;)
  
  http://www.amibroker.com/guide/
  http://www.amibroker.com/guide/AFL.html
  http://www.amibroker.com/guide/tutorial.html
  
Specifically
  
  http://www.amibroker.com/guide/a_language.html
  
BuyPrice and SellPrice are just arrays (not functions) that you can 
store the price in. e.g.
  
// Means you bought at the Open
BuyPrice = Open;
  
// Means your limit order of 5% below yesterday's close got filled at 
5% below or the Open, whichever was lesser.
BuyPrice = min(Ref(Close, -1) * .05, Open);
  
Mike
  
--- In amibroker@xxxxxxxxxps.com,
Noah Bender <knowabender@...> wrote:
>
> Hello all,
> 
> I am new to amibroker and have a newbie question.
> 
> How does buypirce and sellprice function work?
> 
> examples would be appreciated. i am not sure how this value is 
stored.
> 
> thanks in advance
>