This section explains how to run two versions of Chameleon on the same machine using the silent feature of the Chameleon installer program. Running different versions of Chameleon on a single machine may be useful for:

• Testing out the latest upgrade on a machine that already has an older Chameleon version installed.

• Releasing an HL7 interface (built with a previous version of Chameleon) using the latest version.

The Chameleon installation program can be run automatically by your own installation program by invoking some command line switches. Ensure that Chameleon or any applications that use Chameleon are not running when you are using the installer.

	Before performing a silent installation of Chameleon, please note the following: No Start menu or desktop shortcuts will be installed for the new version since shortcuts are not installed when using the silent installation. If you want shortcuts, you must create them manually. An Add/Remove Programs entry will only exist for the most recently installed version of Chameleon. However, you can still manually run the uninstaller program for the older Chameleon version. For .NET applications, the CHM_CSHARP.DLL is removed from the GAC (Global Assembly Cache) when you are upgrading to Chameleon versions 5.0 and higher. As a result, you need to move the original CHM_CSHARP.DLL to your project directory in order to run your application. To ensure that the Chameleon application you've written will still function properly, you must do one of two things: Ensure that the Chameleon application you've written has the new version of Chameleon on its own PATH variable, or Place the application you've written in the same directory as the new Chameleon version being installed. Please also note that the following instructions only apply to users developing their applications using C++, Delphi, C#, VB.NET or Java, since VB 6.0 registers objects that are global to the machine; as such, these instructions will not work.

To configure your installer to silently install a different version of Chameleon on the same machine:

• Download the latest Chameleon installer program from http://interfaceware.com/chameleon_download.html, or download an older version from http://dl.interfaceware.com/chameleon/.

• Create a new directory that is different from the one Chameleon is currently installed in. For example, C:\Program Files\iNTERFACEWARE_2 instead of the default directory C:\Program Files\iNTERFACEWARE\Chameleon.

• Place the chameleon_windows.exe in the new directory you created.

• Use the /DIRECTORY flag when invoking the installer to specify that directory, and invoke the installer by executing it with the /S switch, as shown below:

chameleon_windows.exe /S /DIRECTORY="C:\Program Files\iNTERFACEWARE_2"

Note that the installation process takes a few minutes.

• If you wish, delete the Chameleon installer once it has finished executing.

• Run Chameleon by double-clicking VMstudio.exe in the installation directory.

	To learn more about Chameleon silent installations, see Viewing Valid Command Line Switches and Testing Your Implementation.