Is the bw API that oik uses documented?

The oik plugin provides a series of shortcodes for often included key-information. It is mostly implemented using shortcodes, which are expanded using PHP functions prefixed bw_. e.g. shortcodes [bw_mailto] is handled by function bw_mailto(). The bw_mailto() function is implemented in an include file (bobbcomp.inc). This then invokes a series of other functions, some of which are prefixed with bw_ and others which aren’t.

Is there documentation for these functions? Can I use make use of them in my own code?