Applies To:

OLEClient

Description

The InstanceMode property specifies how APL attempts to connect the OLEClient to an OLE Server.

InstanceMode is a character vector that may be 'ExistingFirst' (the default), 'ExistingOnly' or 'New'. Its value is effective only when the object is created with ⎕WC. Changing InstanceMode with ⎕WS has no effect.

If InstanceMode is 'ExistingFirst', APL attempts first to connect to a running instance of the OLE Server. If there is no running instance, it starts the OLE server to obtain a new object.

If InstanceMode is 'ExistingOnly', APL attempts to connect to a running instance of the object. If there is no running instance, it fails with a DOMAIN ERROR.

Note that in either case, if there is more than one instance running, there is no way to predict to which instance APL will be connected.

If InstanceMode is 'New', APL attempts to start the OLE Server to obtain a new object, whether or not the OLE Server is already running. However, if the OLE Server has registered itself as a single instance object and is already running, APL will be connected to it, and a second instance of the Server will not in fact be started.