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130 Installing applications
Preliminary Layla850 P1B
Installing applications
It is possible to install new applications in your P910a. These
applications can be obtained in several ways, for example:
• from the Internet.
•from a CD.
• from a Memory Stick.
• as an email attachment.
• from other devices.
There are two types of installation files for applications:
• SIS (Symbian Standard Installation) made for P910a or other
Sony Ericsson devices.
• MIDP JAR (Mobile Information Device Profile Java
Archive).
Note SIS and JAR files are installation packages containing one
or more files.
Programs made for the Sony Ericsson P800 and P900 series can
also be used in the P910a.
This chapter also applies to other types of software to install, for
example, system components and add-ons.
Applications from developers outside Sony Ericsson, so-called
third-party developers, might be possible to install in the P910a.
Applications which are not approved by Sony Ericsson are not
guaranteed to work correctly or securely, and users install them
at their own risk. Product failures caused by applications not
approved or made for Sony Ericsson will not be covered by your
warranty.
Installing applications on your
P910a
Installation file security
Installation files in SIS format are typically used for installation
of Epoc or PersonalJava™ applications or other content into the
P910a file system.The vendor who prepared the SIS file decides
where in the file system the various content of the SIS file will
be installed. This means that you need to decide if you trust that
the SIS file does not contain harmful content. If you are certain
of the origin of the SIS file you can take an installation decision
based on what you know about that vendor. Your P910a
supports cryptographic verification of vendor identity.
During installation the P910a verifies a digital signature and
certificate in the SIS file against a root certificate in the phone.
Successful verification means that you can trust the origin of the