These functions can be found after line 213. These functions, as explained before, provide an interface for the ICQ network.
There is actually not much to explain about these functions other than discussing each of them specifically. We should just mention that for most of these functions you need to provide an ICQLINK. This link in fact identifies the connection on which you want to operate so this is important you provide the correct link (this is important when working on a multi-user client).