FEATURE_BFCACHE in IE11

As part of setup for Selenium testing against the IE11 browser they have you set the registry entry FEATURE_BFCACHE. This solved issues I was having with driving tests in IE11, however, they don't say what exactly this setting does. What exactly does setting FEATURE_BFCACHE accomplish?

For 32-bit machines:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BFCACHE]

"iexplore.exe"=dword:00000000

For 64-bit machines:

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BFCACHE]

"iexplore.exe"=dword:00000000