instead of a HANDLE.

  non-control scrollbar resulted in the scrollbar being drawn over the
  whole window area.
- If you don't set WS_HSCROLL/WS_VSCROLL on window creation, setting a scroll
  range does nothing. Setting the scroll range to a non-zero range should cause
  scroll bars to be displayed. Setting the range to a zero range
  should cause the relevant scroll bar to be hidden.

XA_STRING.

Use the client window as drawable when possible.

VxD on NT, add a test case.

on shutdown.

Truncate report file if too big.

functions implemented.