the library
(taken in part from Lehigh
University's Intermediate Dreamweaver site)
The Library is part of the Assets Window. It allows you
to store pieces of a page and insert them anywhere on any page in your
site when you need them. For instance, you can create a 'contact me'
library item, a 'copyright' item, or 'paper guidelines' and insert
them wherever necessary.
Creating a Library Item
To access the Library area, choose 'Library' from the Window
menu.
To add a new library item, click on the right-facing triangle
in the upper right of the Assets window, and choose 'New Library
Item'
or click on the Add Library
Item icon in the lower right.
A new item will be added: 
type in a name for it, such as Contact Info. (If the Name
[Untitled] becomes unselected, click on the name repeatedly until it
is selected again.)
Then, to edit your item, either right-click on it and choose
Edit from the menu, or click on the Edit Item icon in the lower
right
A new Dreamweaver window will come up, and you can create
the library item there:
When you are finished editing, choose Save from the File
menu in the Library Item window.
The Assets window will change to display the Library item:
You can then close the Library Item document window.
Using a Library Item
Place your cursor the point in the document where you want
to insert the item, and selet the library item from the Library window/Assets.
Then click the 'Insert' button in the lower left of the Assets window
to insert the item.
Note: if you later edit the Library item, you will see
a window asking whether you want to update the Library item in the
pages it is already inserted in:
To have the changes you made applied to the files that
already have the library item in them, click Update.
