Could anyone explain me what is variable "boi.call" used for?

I found it in lot of examples, as:

1. if api.mode then
import("boi.call", boi.call)
endif

or, in some other examples:

2. boi.call = "tdboidll0011.Call"

Thank you!

It is used in determining what actions take place in a program when called. I am not sure if it is only api.mode, but some of the code I have seen was around this variable and api.mode being true. In one case for one value it ran some kind of warehouse code for a new product Baan was integrating at that time, and another value it ran the code we needed. There probably is a better explanation, but this is how I think of it. I think it is used for multiple integrations with the standard code - but just speculation on my part.

Thank you for your explanation.
Confused