Caplet (computer security)

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In the CapDesk desktop environment, a caplet is a program that starts off with no authority beyond the ability to interact with the user via a window and to request capabilities via a powerbox.

The term is a pun on applet, combining the term with "cap" which is short for "capability".

Applets such as Java applets often have no non-trivial use, because they do not have—and more importantly, cannot be granted—useful authority, such as the ability to save a file to the user's filesystem. In contrast, caplets are more useful, because they can request and be granted authority in a fine-grained but secure way.