BASE | NN n/a IE 4 DOM 1
A BASE object instructs the browser about the URL path to the current document. This path is then used as the basis for all relative URLs that are used to specify various SRC and HREF attributes throughout the document.
HTML Equivalent
    <BASE>
Object Model Reference
IE | [window.]document.all.elementID

href | NN n/a IE 4 DOM 1
| Read/Write
The URL of a document whose server path is to be used as the base URL for all relative references in the document. This is typically the URL of the current document, but it can be set to another path if it makes sense to your document organization and directory structure.
Example
    document.all.myBase.href = "http://www.megacorp.com"
Value String of complete or relative URL.
Default | Current document pathname.

target | NN n/a IE 4 DOM n/a
| Read/Write
The name of the window or frame that is to receive content as the result of navigating to a link or any other action on the page that loads a new document. Such names are assigned to frames by the FRAME element's NAME attribute; for subwindows, the name is assigned via the second parameter of the window.open( ) method. If you are scripting the navigation of another window or frame, use the window or frame name in a statement that assigns a new URL to the location.href property (frameName.location.href = "newURL").
Example
    document.all.myBase.target = "_top"
Value String value of the window or frame name, or any of the following constants (as a string): _parent | _self | _top | _blank. The _parent value targets the frameset to which the current document belongs; the _self value targets the current window; the _top value targets the main browser window, thereby eliminating all frames; and the _blank value creates a new window of default size.
Default | _self