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Page layouts, the point-and-click tool that allows application developers to Execute from within a browser, causing poor performance if displaying or updating values from more than a How Do Visualforce Pages Compare to S-Controls?
You can reference query string parameters in Visualforce markup by using the $CurrentPage global variable. Using $CurrentPage , you can access the query
A global merge field to access an org cache from a Visualforce page. Retrieve cached values from a specified partition's org cache in the referenced org.
You can set query string parameters in links to pages by constructing the link URL manually, or by using tags within the tag.
As shown in earlier examples, the default page context—that is, the record that provides the source of data displayed on the page—is controlled by a query
2 Nov 2017 Visualforce Developer Guide. Version 41.0 . Getting and Setting Query String Parameters on a Single Page .42. Using Ajax in a

Introducing Visualforce Using Query String Parameters in a Page works before proceeding to the more detailed descriptions in the remainder of this guide.
A PageReference is a reference to an instantiation of a page. Among other attributes, PageReferences consist of a URL and a set of query parameter names
Returns a map of the query string parameters that are included in the page URL. The key string contains the name of the parameter, while the value string

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March 2018