its return value.  A lock count of 2 or
more is definite indication of an error, probably calling the function
twice.  Access to the device should be controlled by checking the Windows
message queue only when the bitmap is not being accessed.
</blockquote>

<hr>

<h2><a name="Callback"></a>Callback function</h2>

<blockquote>
As an argument to <a href="#init"><b><tt>gsdll_init()</tt></b></a> the
caller must provide a callback function which the DLL invokes for stdio and
to notify the caller about device eve