BIG-IP management of client requests queue.

The BigIP is a name for a set of hardware (and software now that a virtual version is available). It has many modules that can be licensed per BigIP. These modules do vastly different things.

The BigIP iControl API is for managing, changing, querying the BigIP system. It is not a module itself. Here is a list of the modules that perform functions for environment. https://f5.com/products/modules

Here is a link to an iControl API white paper. It is older but has relevant information letting you get an idea of what iControl is used for. http://www.f5.com/pdf/white-papers/icontrol-wp.pdf

Jason