Nokia N81

Page 83
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Applications
83
 Note: This calculator has limited accuracy and is 
designed for simple calculations.
Notes 
To write notes in .txt format, press 
, and select 
Applications
> 
Notes
.
Application manager 
Press , 
and 
select 
Applications
> 
App. mgr.
. You can 
install two types of applications and software to your 
device:
•
J2ME
TM
 applications based on Java
TM
 technology with 
the extension .jad or .jar (
). 
•
Other applications and software suitable for the 
Symbian operating system (
). The installation files 
have the .sis extension. Only install software 
specifically designed for your Nokia N81. Software 
providers will often refer to the official model number 
of this product: the Nokia N81-3.
Installation files may be transferred to your device from a 
compatible computer, downloaded during browsing, or 
sent to you in a multimedia message, as an e-mail 
attachment, or using Bluetooth connectivity. You can use 
Nokia Application Installer in Nokia Nseries PC Suite to 
install an application to your device.
Install applications and software
 
 indicates a .sis application, 
 a Java application, 
 
that the application is not fully installed, and 
 that the 
application is installed in the memory card.
 Important: Only install and use applications and 
other software from trusted sources, such as applications 
that are Symbian Signed or have passed the Java Verified
TM
 
testing.
Before installation, note the following:
•
To view the application type, version number, and the 
supplier or manufacturer of the application, select 
Options
> 
View details
.
To display the security certificate details of the 
application, in 
Certificates
, select 
View details
. See 
•
If you install a file that contains an update or repair to 
an existing application, you can only restore the 
original application if you have the original installation 
file or a full back-up copy of the removed software 
package. To restore the original application, remove the 
application, and install the application again from the 
original installation file or the back-up copy.
•
The .jar file is required for installing Java applications. 
If it is missing, the device may ask you to download it. 
If there is no access point defined for the application, 
you are asked to select one. When you are downloading 
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