Returns the platform-specific handle of the physical window. Cast it to an appropriate
handle, such as {\bf HWND} for Windows, {\bf Widget} for Motif or {\bf GtkWidget} for GTK.
+\pythonnote{This method will return an integer in wxPython.}
+
\membersection{wxWindow::GetId}\label{wxwindowgetid}
\constfunc{int}{GetId}{\void}