Enabling HTML Help over a (Local) Network

go RegEdit:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\ItssRestrictions
Right-click the MaxAllowedZone (DWORD) value, and then click Modify.

Valid values for MaxAllowedZone

 MaxAllowedZone  Local Machine  Local Intranet  Trusted Sites  Internet  Restricted Sites
 0  Allowed  Blocked  Blocked  Blocked  Blocked
 1  Allowed  Allowed  Blocked  Blocked  Blocked
 2  Allowed  Allowed  Allowed  Blocked  Blocked
 3  Allowed  Allowed  Allowed  Allowed  Blocked
 4  Allowed  Allowed  Allowed  Allowed  Allowed

Microsoft recommends that you don’t set the value higher than 2:
“If you set the MaxAllowedZone value to 3 or higher, you expose systems to attack from the Internet”.

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