NAME
	LockRealTime -- prevent other tasks from changing internal structures.
			(V37)

   SYNOPSIS
	lockHandle = LockRealTime(lockType);
	D0                        D0

	APTR LockRealTime(ULONG);

   FUNCTION
	This routine will lock the internal sempahores in the RealTime library.
	If they are already locked by another task, this routine will wait
	until they are free.

   INPUTS
	lockType - the internal list to lock. Only RT_CONDUCTORS is
		   currently defined.

   RESULT
	handle - if lockType is valid, returns a value that must be passed
		 later to UnlockRealTime() to unlock the list. Returns NULL
		 if passed an invalid lock type.

   SEE ALSO
	UnlockRealTime()