FAQ & IdTelnet error 10038

I am trying to hunt down information how to properly Disconnect from
an IdTelnet session.  An exception is thrown up (which apparently
*might* be just fine), but I would like to know for certain

Someone wrote:
>> RTFM or STFW!!!!! (specifically IDStack.pas OR IdConnection.pas)

But this there is no evident information on this.  Does anyone know if
a FAQ exists for IdTelNet?

TIA  ..Vern