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Inside Macintosh: Networking /

Chapter 2 - AppleTalk Utilities / About the AppleTalk Utilities

Sending Packets to Applications and
Processes on Your Own Node

Because more than one application or process can be running on a single node at the same time, it is reasonable to assume that you may want to send packets from your application or process to other applications and processes running on the same node. To support this, AppleTalk includes a function that lets you turn on (or off) an intranode delivery feature.

When intranode delivery is on, two programs running on the same node can communi-
cate with each other through the AppleTalk protocols. You can address and send a packet to another application or process that is an internet socket client running on your own node from any of the AppleTalk protocols that provide programming interfaces.

You use the PSetSelfSend function to enable or disable intranode delivery. The PSetSelfSend function returns the value of the previous setting, so that you can
save it and reinstate the value later if it differs from the setting that you specify. For
more information about enabling or disabling intranode delivery, see "PSetSelfSend" beginning on page 2-15.

Note

Intranode delivery applies to user node applications and processes. Sending packets between a multinode application and user node applications on the same machine is independent of the intranode delivery feature. A multinode is treated as a virtual node distinct from the user node; both the user node and the multinode have their own node IDs.