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$CurrentPage
A global merge field type to
use when referencing the current Visualforce page or page
request.
Usage
Use this global variable in a Visualforce page to reference the current page name ($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.