~/Library/Preferences/com.apple.sidebarlists.plist

In Terminal, run the following command. You should find the word Network mentioned at least once in your .plist preference file:

defaults read com.apple.sidebarlists | grep Network

Applicability

As I can't drag Network to my Finder sidebar — and as sidebar takes a different approach to showing shared items — I guess that:

• in Lion, Network is no longer applicable in the FAVORITES part of the sidebar
• maybe for you, Network was amongst sidebar favourites in a previous version of the operating system.

Removing unwanted items from the property list

Probably easiest with Xcode.

If you don't have Xcode, then use TextWrangler or anything that's capable of editing this type of property list.

Identifying items in the .plist

Xcode views of the property list:

A TextWrangler view:

To view Network, with or without the sidebar

⇧⌘K

In the sidebar

1. show SHARED
2. click All…

If the option 'All…' does not appear

First try removing, from the property list, unwanted or redundant items relating to Network.

A guess: it may be necessary to quit Finder, or log out, before some types of change become effective.

If following removals and a log out you find that SHARED is still without All…, consider asking a separate question.

Almost all of the Mac developer documentation from Apple exists in several places. That being said, you want the unofficial Mac OS X Automation guide put together by Sal Soghoian. He also has a fabulous book on the iBook store titled AppleScript 1-2-3.

Xcode is the tool that links into these libraries and allows you to search across the various user guides, developer guides, language specifications, code examples and such.

Here is Xcode (with 10.6 and 10.7 documentation sets) and a quick AppleScript search.

Xcode makes it easier to bookmark, search and use the documentation rather than just browsing in Safari since it will download the whole

Of the 232 matches in the System Guides - about 10 cover AppleScript in depth - the rest refer to how programs make themselves available to be scripted by AppleScript.