Rockwell Automation FactoryTalk Historian SE ActiveView 3.2 User Guide - Manual (Page 41)

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For Developers: Administering FactoryTalk Historian ActiveView
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FactoryTalk Historian ActiveView Executable
The FactoryTalk Historian ActiveView executable, acview.exe,
displays data in the Display file. If you open additional Display
Documents, the same instance of acview.exe continues to be used as
the ActiveX (OLE) server; it is not necessary to log in to the Historian
Server again.
To improve performance, acview.exe caches the five most recently
viewed displays on your PC. To maintain the cache of recently viewed
displays as well as to preserve the necessary Historian Server connections,
acview.exe continues to run, by default, for five minutes after the last
instance of pbdctrl.ocx is closed.
To maintain the server connection and prevent repeated logins, the
acview.exe process runs for the length of the timeout setting after the
last instance of the FactoryTalk Historian ActiveView Control is
destroyed. For example, if you navigate from one Web page to another and
both use the FactoryTalk Historian ActiveView control, acview.exe
continues to run. The default timeout period is five minutes.
In order to operate, acview.exe requires several supporting .dlls,
ADO core components, and VBA core components.
The acview.exe Timeout
You can change the acview.exe timeout duration by resetting the
registry key value:
HKEY_CLASSES_ROOT\CLSID\{576EFBE0-77F3-11D2-A05B-
00105A07D444}\TimeOut
Where TimeOut is the number of seconds, rounded up to the next minute,
after which acview.exe stops running after all the open instances of the
control are closed.