1.0 ADMIN/NON INTERACTIVE INSTALLATIONS:
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If you want to install EiffelStudio/EiffelEnvision in admin mode without any interactions, such
the case of multiple installations please read the following:

1.1 Installer Properties
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1.1.1 Require Properties

There are a number of variables that *have* to be set to install successfully. These are detailed below:

    - C_CONFIG_NAME       : Either "msc", for using a preinstalled Microsoft C/C++ compiler or "mingw" to install and use GCC.
                            NOTE: GCC can only be used for the x86 version of EiffelStudio.

    - PID                 : For Enterprise editions of any installer a personal identifier is require, which is in the form of a CD-KEY for the
                            installing application. For GPL/Free Trial installations this information is not required.

1.1.2 Optional Properties
                           
There are also a number of properties that can be optionally defined, but should be defined for they sake of sanity:
    
    - INSTALLDIR          : This is the installed location of the application being installed by the installer and should end in a directory
                            separator character '\'
            
2.0 ADVANCED USER INTERACTION:
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For special purposes it may be necessary to access installer pages that may not be visible during an installation. Below outlines the install

2.1 C/C++ Compiler Configuration
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* Setting the property C_CONFIG_CHOOSE=1 via a command line installation will show the C/C++ compiler configuration page.

3.0 END NOTE:
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All those properties marked with an asterix '*' indicate that the property is only effective for EiffelStudio installations.