Referencing custom indicators in back testing

[Yuki Taga <yukitaga@xxxx>]

All:

Probably pretty simple answer, but I can't find it. How do I write a
reference to my own custom indicator for a buy or sell Signal?

For example, if I create a custom indicator called DSS, how do I
write a buy formula that specifies DSS be less than 30 but higher
than the previous day's DSS. (I understand ref() of course, but
cannot seem to write my own indicator as a function in AFL that the
system will accept.)

Yuki ^_^

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