What are Sharepoint Querystring Parameters?

Here are some Query String parameters that I think every SharePoint Developer\Implementer must know about it
 
To open the Web Part Maintenance Page

"?Contents=1"


To Open the Page in Web Part Design Mode

"?ToolPaneView=2"


To Open the Search Web Part Zone

"?ToolPaneView=3"


To open the Design Bar - Useful for pages in the Pages Library

"?DisplayMode=Design"


To turn on Web Part Zone Editing

"?ControlMode=Edit"


To Show the Shared version of a page

"?PageView=Shared"


To Show the Personal version of a page

"?PageView=Personal"