Hello there, I''m programming this interface with some tools from a library and there is this virtual function which you can override virtual BOOL OpenSpecificChildFrame(SECPersistentTreeNode* pNode, CDocument** ppDoc, CFrameWnd** ppFrame, CFrameWnd** ppActiveChildFrame); as you can see there are double pointers in there. Can any one tell me what''s so cool about double pointers and how you use them. Thnx, Erik

they let you change the value of a pointer
you use em more or less like normal pointers

A ** is a pointer to a pointer, or the address of a pointer...