BrowserNavConstants Enumeration

      public enum BrowserNavConstants
        {
            navOpenInNewWindow = 1,
            navNoHistory = 2,
            navNoReadFromCache = 4,
            navNoWriteToCache = 8,
            navAllowAutosearch = 16,
            navBrowserBar = 32,
            navHyperlink = 64,
            navEnforceRestricted = 128,
            navNewWindowsManaged = 256,
            navUntrustedForDownload = 512,
            navTrustedForActiveX = 1024,
            navOpenInNewTab = 2048,
            navOpenInBackgroundTab = 4096,
            navKeepWordWheelText = 8192,
            navVirtualTab = 16384,
            navBlockRedirectsXDomain = 32768,
            navOpenNewForegroundTab = 65536
        }

Enum BrowserNavConstants
    navOpenInNewWindow = 1
    navNoHistory = 2
    navNoReadFromCache = 4
    navNoWriteToCache = 8
    navAllowAutosearch = 16
    navBrowserBar = 32
    navHyperlink = 64
    navEnforceRestricted = 128
    navNewWindowsManaged = 256
    navUntrustedForDownload = 512
    navTrustedForActiveX = 1024
    navOpenInNewTab = 2048
    navOpenInBackgroundTab = 4096
    navKeepWordWheelText = 8192
    navVirtualTab = 16384
    navBlockRedirectsXDomain = 32768
    navOpenNewForegroundTab = 65536
End Enum

https://msdn.microsoft.com/en-us/library/dd565688(v=vs.85).aspx