[amibroker] AFL capabilities and limitations?

["indo26_slate" <indo26_slate@xxxxxxxxxxxx>]

I have some questions about AFL's capabilities. I will ask more 
general questions, and then ask more specific questions which use 
examples.

q1) I understand that the AFL program is executed once for each 
company code that is being backtested. Can the program be written to 
consider which company is in context when being executed? so for 
example, could I use _TRACE to print debug info, where I am printing 
the ASX code in context. example: BHP

q2) More in depth to question 1 - can I write the program to 
consider the state of an index (such as the all ords index), in 
order to define buy/sell logic? Perhaps the logic may read (in 
english) - I will only buy if yesterday's all ords close is higher 
than the day before. 

q3) Considering that a single AFL program is executed many times 
during a backtest (once for each stock in the watchlist), is there a 
concept of global variables, where
the AFL program can reference a variable/value written in a previous 
execution? for example, is it possible to know how many buys have 
been assigned (how many positions are open). For example,
I may want to program my backtest to only allow 10 positions to be 
open at any one time. (or a more complex way of limiting the number 
of open positions, rather than hard-coded 10) Is it possible to 
write AFL code to do this?




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