rtrace persistent mode

Hi all, i'm yet working in a wxwindows application for interactive opengl viewing mixing glrad and rview, for rview i am using a separate process with rtrace, so i dont get idle the main application, but i have a problem when i change the view(interative) all the values sended to rtrace must be erased, i've thinked to use the rtrace persistent mode but it doesn't go under windows(F_SETLKW undefined) is'nt it?