Locking Components
Before editing a component, you should lock the component. Locking prevents the component from being edited by other users in parallel. The component lock can be released manually. It is released automatically after the configured lock interval has expired. For details about how to configure the component lock interval, see Defining Content Lock Period.
Tip: Upon editing the component, it is automatically locked for you if it has not been locked already by another user.
Basically, there are two ways to lock components: either directly from the component list, or via the component detail view.
Locking Components in List View
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Select the management context from the context selection box, then select Content | Components.
This opens the Components list view.
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Click the
icon in the row of the component(s) you intend to edit.
An error message appears if the component is currently edited by another user.
Tip: Click the 
icon to release the component lock when you are done.
icon to release the component lock when you are done.Locking Components in Detail View
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Select the management context from the context selection box, then select Content | Components.
This opens the Components list view.
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Click the name of the component you intend to edit.
This opens the Content tab of the detail view.
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Click the icon at the dialog top.
An error message appears if the component is currently edited by another user.
Note: Click the icon to release the component lock when you are done.
icon to release the component lock when you are done.