TCM_HITTEST


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TCM_HITTEST
TCM_HITTEST 
    wParam = 0;
    lParam = (LPARAM) (LPTCHITTESTINFO) pinfo;
Determines which tab, if any, is at a specified screen position. You can send this message explicitly or by using the TabCtrl_HitTest macro.
Returns the index of the tab, or -1 if no tab is at the specified position.

pinfo
Address of a TCHITTESTINFO structure that specifies the screen position to test.

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