User's Manual

Table Of Contents
User Manual
What is a MIDlet?
A Java™ application or a game designed to run in a mobile
phone is named a MIDlet [MIDP applet].
A MIDlet is usually made of 2 files:
The JAD file
–The JAR file
JAD file stands for Java™ Application Descriptor. It is a small
file describing the content of a JAR file.
JAR file stands for Java™ Archive. It refers to the application
data themselves [program, images, sound]. A JAR file may be
up to 200 kilo-bytes large.
Note: In rare circumstances, MIDlet vendors may provide
no JAD file and the MIDlet is the JAR file alone. In such a
case it is your only responsibility to evaluate the risk to
download the JAR file without possibility of consulting the
JAD file.
Downloading a MIDlet [Java™ game or application]
MIDlets are easily downloaded in the mobile phone through
the Games or Applications menus or through the WAP
browser. In almost all cases, you will first receive a JAD file
which will be displayed on the screen.
When you select a JAD file, your mobile phone downloads it,
displays data contained and prompts you to acknowledge the
JAR file download.
The popup displays information below:
Name of the MIDlet, Version, Size, Name, Security status,
URL.
If you do not want to download the main data [JAR file], you
shall refuse to acknowledge further airtime consumption by
selecting "Cancel".
If you agree on the MIDlet installation, just select [OK]. The
MIDlet is installed with security levels set to default values
associated with its security status.
Before downloading an application, such a message may
appear: "Your handset cannot identify the application, please
be sure of the source of the application before installing the
application".
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