Mac OS 8.5 Technote: Part XXXV

Copyright 1998 by Apple Computer, Inc. All Rights Reserved.

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Inside the System File (Continued)

PPC Toolbox

The Program to Program Communications Toolbox provides process-to-process communications facilities both for processes running on the same machine and for processes running on different computers connected by an AppleTalk network.
  • The PPC Browser now handles low memory situations without crashing.

  • In previous versions of the PPC Browser, the NBP lookup for the list of computers was using too short of a delay. As a result, the list of computers would flicker over slower network connections. The NBP lookup now uses a longer delay so the list is drawn with less flicker.

  • The PPC Browser now performs extensive internal error checking.

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Process Manager

The Process Manager shares the processor among multiple applications. Mac OS 8 includes the following new features in the Process Manager:
  • Under some circumstances, the cursor would not change to the cross hairs as expected for small area screen captures. This has been corrected.

  • LaunchApplication now honors alias files.

  • Process Manager is slightly more strict about when it will call jGNEFilter for "fake" keyDown events created by the Text Services Manager, eliminating some duplicate events.

  • During application switches, the Process Manager now checks if a mouse down was pending in the event queue for the foreground application or any floating windows in the Text Services Manager layer. This correction eliminates the possibility of a mouse click in one of the foreground application's windows sneaking through to the application being switched in.

  • The Process Manager will no longer launch invisible 'appe' files.

  • If a process unmounted a volume that was the default volume for one or more other processes, the default volume was not correctly updated for those other processes when they were switched in. This could result in a File Manager disk switch dialog appearing asking for a disk with a garbage or blank volume name. The Process Manager now ensures that the File Manager's default volume is valid when switching processes.

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