You never draw directly onto a window --- you use a {\it device context} (DC). \helpref{wxDC}{wxdc} is
the base for \helpref{wxClientDC}{wxclientdc}, \helpref{wxPaintDC}{wxpaintdc}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxPostScriptDC}{wxpostscriptdc},
-\rtfsp\helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxMetaFileDC}{wxmetafiledc} and \helpref{wxPrinterDC}{wxprinterdc}.
+\rtfsp\helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxMetafileDC}{wxmetafiledc} and \helpref{wxPrinterDC}{wxprinterdc}.
If your drawing functions have {\bf wxDC} as a parameter, you can pass any of these DCs
to the function, and thus use the same code to draw to several different devices.
You can draw using the member functions of {\bf wxDC}, such as \helpref{wxDC::DrawLine}{wxdcdrawline}\rtfsp
\rtfsp\helpref{wxWindow::OnMouseEvent}{wxwindowonmouseevent}.
Most modern applications will have an on-line, hypertext help system; for this, you
-need wxHelp and the \helpref{wxHelpControllerBase}{wxhelpcontrollerbase} class to control
-wxHelp. To add sparkle, you might use the wxToolBar class (documented separately)
+need wxHelp and the \helpref{wxHelpController}{wxhelpcontroller} class to control
+wxHelp. To add sparkle, you might use the wxToolBar class
which makes heavy use of the \helpref{wxBitmap}{wxbitmap}.
GUI applications aren't all graphical wizardry. List and hash table needs are