Under what circumstances is it useful to create a Client Button?

To make a custom button available from the Interaction Client/Desktop to make it easy for call center agents to access an application when they are on a customer call.

When you want to make a custom button for agents to quickly open their Interaction Client application when they arrive at work.

When you have created a unique interface using an API and want to add a custom Pickup button to it.

You want your customers to be able to phone you by pressing a custom button on a web page.