title: Callback functions in client dll of Citrix virtual channel are not called
body: <p>I have the following problem: I've created client DLL with all needed callback functions (<code>DriverOpen</code>, <code>DriverClose</code> etc.). But they are not called, and I, actually, don't know why. Test <code>dll vdping</code> is working fine. May be the thing is I use VS2010 to build that DLL? Or should I use any specific compiler or link flags?</p>