The LAP Manager

The LAP Manager Operating system interface utilities

The LAP Manager is a set of operating-system utilities that provide a

standard interface between the AppleTalk protocols and the various link access

protocols, such as LocalTalk (LLAP), EtherTalk (ELAP), and TokenTalk

(TLAP). Because The LAP Manager is running even at those

maintains the AppleTalk Transition Queue. In addition, The LAP Manager

contains protocol handlers for certain types of 802.2 packets.

This section describes the AppleTalk Transition Queue, tells you how to add or

remove an AppleTalk Transition Queue entry, and describes how to attach or

detach your own 802.2 protocol handler. In addition to The LAP Manager

features described here, you can use The LAP Manager to interface new data

links to AppleTalk. For more information about The LAP Manager, see the

Macintosh AppleTalk Connections Programmer's Guide.

The AppleTalk Transition Queue

At any given time there might be two or more applications running that use

AppleTalk. If one of these applications opens the AppleTalk drivers, the other

AppleTalk applications are affected. If the Operating System closes the

AppleTalk drivers, all AppleTalk applications are affected. To ensure that your

application is not adversely affected by such an event, your application can

place an entry in the AppleTalk Transition Queue. The LAP Manager sends a

message to each entry in the AppleTalk Transition Queue each time the

Operating System or any routine

• indicates that it intends to close The .MPP Driver

• cancels its intention to close The .MPP Driver

• defines its own AppleTalk event and calls the AppleTalk Transition

Queue to inform it that such an event occurred

Each of these events is referred to as an AppleTalk transition.

Because The .MPP Driver is not necessarily open when the AppleTalk

Transition Queue must be called, LAP Manager maintains the queue. Each

entry in the AppleTalk Transition Queue is defined by the ATQ entry data type.

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