/**
Returns the platform-specific handle of the physical window.
Cast it to an appropriate handle, such as @b HWND for Windows,
- @b Widget for Motif, @b GtkWidget for GTK or @b WinHandle for PalmOS.
+ @b Widget for Motif or @b GtkWidget for GTK.
@beginWxPerlOnly
This method will return an integer in wxPerl.