dOPC Client Toolkit Help file
TdOPCGroup.Refresh Method
public: __fastcall Refresh(
    boolean ReadFromCache = true
public Refresh(
    boolean ReadFromCache
Visual Basic
Public Sub Refresh(
    ReadFromCache As boolean = true

Refresh generates an event for all active items in the group (whether they have changed or not) to refresh their values.

Inactive items are not included in the callback. The values are returned via the OnDatachange event. If ReadFromCache is True, all items will be refreshed from the cache. Otherwise or if no cache exists, the items will be obtained from the underlying device.

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