From http://www.w3schools.com (Copyright Refsnes Data)

WML <access> tag

The <access> tag defines information about the access control of a WML deck.

Note: If the <access> tag is not set, any other decks/cards can access the deck.

Note: The <access> tag always goes inside the <head> tag. Each deck can have only one <access> tag.

Syntax

<head> 
<access/> 
</head>

Attribute	Value	Description
domain	cdata	The URL of other decks that can access cards in the deck
path	cdata	The URL of other decks that can access cards in the deck
class	cdata	Sets a class name for the element. The class name is case sensitive. An element can be connected to multiple classes. Multiple class names within the class attribute are separated by white space
id	id	Sets a unique name for the element

Access is limited to other decks/cards in www.w3schools.com:

<head>
 <access domain="www.w3schools.com"/>
</head>

Access is limited to other decks/cards in www.w3schools.com/wap:

<head>
 <access domain="www.w3Schools.com" path="/wap"/>
</head>