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# Properties That Affect the Behavior of Rich Internet Applications

Java Rich Internet Applications Guide > Properties That Affect the Behavior of Rich Internet Applications

The following properties can be specified in a rich Internet application's JNLP file to control the behavior of the rich Internet application (RIA - applet and Java Web Start applications).

Property | Allowed Value | Description
--- | --- | ---
`javaws.cfg.jauthenticator` | true / false | A value of "true" or "all" prevents Java Web Start software from installing the default `JAuthenticator`.
`jnlp.concurrentDownloads` | integer | Number of threads for concurrent download of JAR files
`jnlp.packEnabled` | true / false | A value of "true" indicates that the application's JAR files have been compressed using the Pack200 tool. See Deploying JAR Files Compressed with Pack200 for more information.
`jnlp.versionEnabled` | true / false | A value of "true" indicates that the application's JAR files have been versioned to enable the version download protocol. Version download is the ability to request that specific versions of certain JAR files be used by applets and Java Web Start applications. When this property is set to `true` and if the JAR version is specified, the server is checked for the versioned JAR file using the following naming convention:
      <file> ::= <name> "__" <options> ".jar"
      <options> ::= "V" <version-id>
Note: version 1.0 of foo.jar should be named foo__V1.0.jar. The original jar will be used if the versioned jar file is not found.

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