| # Accessibility Properties

### Indicating the Presence of a Screen Magnifier

> The `javax.accessibility` package provides the `screen_magnifier_present` property. When set to `true`, this property lets the Java platform libraries know that a screen magnifier is present on the system. Application developers can check this property, and if a screen magnifier is present, developers should make sure their applications are compatible with screen magnification. For example, on Microsoft Windows operating systems, the reference implementation of the Java 2DTM API checks this property and if `true`, turns off Microsoft DirectDraw to avoid problems with the screen magnifier. (Some screen magnifiers may not be able to magnify DirectDraw graphics.)

> You can set the `screen_magnifier_present` property at run time or in a properties file. To set the property at run time, enter a command such as the following:

> `java -Djavax.accessibility.screen_magnifier_present=true foo.class`

> The reference implementation includes an `accessibility.properties` file in the `jre/lib` directory. To set the `screen_magnifier_present` property to `true` in the `accessibility.properties` file, add the following line:

> `screen_magnifier_present=true`

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