# ActivateAtStorage

Servers can install this named-value on client machines. When this value is not overridden by certain parameters passed to distributed COM activation API functions, the ActivateAtStorage named-value configures the client to instantiate objects on the same machine as the persistent state they are using or from which they are initialized.

Registry Entry

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\APPID\
{AppID_value}\ActivateAtStorage = value

Remarks

The ActivateAtStorage named-value can be set by the server to configure the client to instantiate its objects on the same machine as the persistent state used or from which the objects are initialized. The value is a REG_SZ; any value beginning with Y or y means that ActivageAtStorage should be used.

When a value is set for ActivateAtStorage, this becomes the default behavior in calls to the CoGetInstanceFromFile and CoGetInstanceFromIStorage functions, as well as to the file moniker implementation of IMoniker::BindToObject.

In all of these calls, specifying a COSERVERINFO structure overrides the setting of ActivateAtStorage for the duration of the function call. The caller can pass COSERVERINFO information to IMoniker::BindToObject through the BIND_OPTS2 structure.

The value set for ActivateAtStorage is also the default behavior when CLSCTX_REMOTE_SERVER is specified if no registry information for the class is installed on the client’s machine. Client applications written to take advantage of ActivateAtStorage may therefore require less administration.

The ActivateAtStorage capability provides a transparent way to allow clients to locate running objects on the same machine as the data that they use. This reduces network traffic, because the object performs local file-system calls instead of calls across the network.

See Also

CoGetInstanceFromFile, CoGetInstanceFromIStorage, IMoniker::BindToObject, COSERVERINFO structure, CLSCTX, Registering COM Servers