$CurrentPage

Usage

Use this global variable in a Visualforce page to reference the current page name ($CurrentPage.Name) or the URL of the current page ($CurrentPage.URL). Use $CurrentPage.parameters.parameterName to reference page request parameters and values, where parameterName is the request parameter being referenced. parameterName is case sensitive.

Example

1<apex:page standardController="Account">
2    <apex:pageBlock title="Hello {!$User.FirstName}!">
3        You belong to the {!account.name} account.<br/>
4        You're also a nice person.
5    </apex:pageBlock>
6    <apex:detail subject="{!account}" relatedList="false"/>
7    <apex:relatedList list="OpenActivities" 
8      subject="{!$CurrentPage.parameters.relatedId}"/> 
9</apex:page>