Check all Callouts function pointers for NULL before using them.
Don't load USER dll if not needed by the application.

diff --git a/include/task.h b/include/task.h
index cb666eb..75cdc59 100644
--- a/include/task.h
+++ b/include/task.h
@@ -147,7 +147,7 @@
 
 extern BOOL TASK_Create( struct _NE_MODULE *pModule, UINT16 cmdShow,
                          struct _TEB *teb, LPCSTR cmdline, BYTE len );
-extern void TASK_KillTask( HTASK16 hTask );
+extern void TASK_ExitTask(void);
 extern HTASK16 TASK_GetNextTask( HTASK16 hTask );
 extern void TASK_Reschedule(void);
 extern void TASK_InstallTHHook( THHOOK *pNewThook );