Copyright ã1995 by NeXT Computer, Inc.  All Rights Reserved.

Protocols

NXLock

Adopted By:	NXConditionLock
NXLock
NXSpinLock
NXRecursiveLock

Declared In:	machkit/NXLock.h

Mandatory methods

- lock	Acquires the lock

- unlock	Releases the lock

NXReference

Adopted By:	IXFileFinder
IXStoreBlock
NXConnection
NXInvalidationNotifier
NXProxy

Declared In:	machkit/reference.h

Mandatory methods

- addReference	Adds a reference

- free	Removes a reference, possibly freeing object

- references	Returns number of references

NXSenderIsInvalid

Adopted By:	NXConnection
NXDataLinkManager

Declared In:	machkit/senderIsInvalid.h

Mandatory methods

- senderIsInvalid:sender	Sent when sender becomes dysfunctional