[fw-mvc] is sublass of Zend_Controller_Action singleton?

Can I keep some instance variables in controller class?

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Enviroment
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OS:
SUSE Linux Enterprice 10 (i586) - version 2.6.16.60-0.27-smp
Windows XP

Tomcat v6.0.16
Java(TM) SE Runtime Enviroment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode)
Maven v2.0.9
Apache 2.2.11
MySQL 5.1.30
PHP 5.2.8
qooxdoo-0.8.2
Python 2.5
Zend framework 1.9.1

Hudson:
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version 1.304
plugins: Maven 1.304, SSH Slaves
running: deployed in Tomcat

front-end developer web-based application
A.S.E.I. [http://www.asei.cz]
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