[uCommand] HELP_WM_HELP [dwData] Address of an array of DWORD pairs. The first DWORD in each pair is a control identifier, and the second is a context identifier for a topic. The array must be terminated by a pair of zeros {0,0}. If you do not want to add Help to a particular control, set its context identifier to -1. [Action] 
Displays the topic for the control identified by the hWndMain parameter in a pop-up window.