Different kind of custom fields in queue preferences

[Giulio Soleni]

Hallo,
I recently added a couple of custom fields to the AdminQueue menu using queue preferences.
Specifically I added the following /opt/otrs/Kernel/Config/Files/QueueCustomerOrder.xml file:

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<?xml version="1.0" encoding="utf-8" ?>
<otrs_config version="1.0" init="Framework">
<ConfigItem Name="QueuePreferences###CustomerOrderField" Required="0" Valid="1">
        <Description Translatable="1">Defines Customer Order field for queue.</Description>
        <Group>Ticket</Group>
        <SubGroup>Frontend::Queue::Preferences</SubGroup>
        <Setting>
            <Hash>
                <Item Key="Module">Kernel::Output::HTML::QueuePreferences::Generic</Item>
                <Item Key="Label" Translatable="1">Customer Order</Item>
                <Item Key="PrefKey">OrderId</Item>
                <Item Key="Block">Input</Item>
                <Item Key="Data">$Env{"OrderId"}</Item>
                <Item Key="Prio">6101</Item>
                <Item Key="Active">1</Item>
            </Hash>
        </Setting>
    </ConfigItem>
</otrs_config>

This codes works for me (at least it seems so), however, from this howto viewtopic.php?f=60&t=19936 I see that there might be another item, like:

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<Item Key="Key" Translatable="1">Customer Order</Item>

But I am not sure about its actual meaning... what is it for?

Also, I see on /opt/otrs/Kernel/Output/HTML/Templates/Standard/AdminQueue.tt that there are several kinds of possible custom fields.

What's the difference between InputKey and Input types?

Thank you for any possible information