void FreeScrnTrack(void *scrn_track);
void *AllocScrnTrack(void);
void *AllocScrnTrackMem(void *scrn_track,ULONG size);

void AddScrnTrack(void *scrn_track,struct Screen *scrn);
void *GetScrnTrack(struct Screen *scrn);
void *CheckScrnTrack(struct Screen *scrn);
BOOL CloseScrnTrack(struct Screen *scrn);