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<concept id="GUID-C23196E8-FDD3-4A10-9DA2-DA83A2AD49D9" xml:lang="en"><title>Applications with an user interface</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>If you are developing an application with an user interface, consider the following issues:</p>
<ul>
<li><p>Other applications may have access to the information that the user inputs.</p></li>
<li><p>A hostile application may lure the user to enter information that belongs to another application.</p></li>
</ul>
<p>Password dialogs in particular should be designed so that the user easily recognizes the currently running application.</p>
<section><title>User input</title>
<p>It is possible for the user to unintentionally enter incorrect data that can interfere with the normal operation of the application. All input should be checked and validated before processing. A one-time check may not be enough because the content of data can change during processing, so it is therefore advisable to quickly check the data every time it is used.</p>
<p>The following figure shows an example of input processing phases.</p>
<fig id="GUID-6C871726-D4DB-40FC-A2F8-ADDA2B9A4E9C"><title>Examples of input processing</title><image href="GUID-63AD2899-FDDC-4E3F-8876-C72EC7C194CE_d0e8401_href.png"/></fig>
<p/>
</section>
</conbody></concept>