The Connection Group Virtual Environment
In this topic:
The virtual environment and its current state are associated with the connection group, not with the individual packages. If an App-V package is removed from the connection group, the state that existed as part of the connection group will not migrate with the package.
If the same package is a part of two different connection groups, you have to indicate which connection group App-V should use. For example, you might have two packages in a connection group that each define the same registry DWORD value.
The connection group that is used is based on the order in which a package appears inside the AppConnectionGroup XML document:
The first package has the highest precedence.
The second package has the second highest precedence.
Consider the following example section:
Assume that same DWORD value ABC (HKEY_LOCAL_MACHINE\software\contoso\finapp\region) is defined in the first and third package, such as:
Package 1 (A8731008-4523-4713-83A4-CD1363907160): HKEY_LOCAL_MACHINE\software\contoso\finapp\region=5
Package 3 (04220DCA-EE77-42BE-A9F5-96FD8E8593F2): HKEY_LOCAL_MACHINE\software\contoso\finapp\region=10
Since Package 1 appears first, the AppConnectionGroup's virtual environment will have the single DWORD value of 5 (HKEY_LOCAL_MACHINE\software\contoso\finapp\region=5). This means that the virtual applications in Package 1, Package 2, and Package 3 will all see the value 5 when they query for HKEY_LOCAL_MACHINE\software\contoso\finapp\region.
Other virtual environment resources are resolved similarly, but the usual case is that the collisions occur in the registry.
If two or more packages in a connection group contain identical directory paths, the paths are merged into a single virtual directory inside the connection group virtual environment. This merging of paths allows an application in one package to access files that are in a different package.
When you remove a package from a connection group, the applications in that removed package are no longer able to access files in the remaining packages in the connection group.
The order in which App-V looks up a file’s name in the connection group is specified by the order in which the App-V packages are listed in the connection group manifest file.
The following example shows the order and relationship of a file name lookup in a connection group for Package A and Package B.
|Package A||Package B|
In the example above, when a virtualized application tries to find a specific file, Package A is searched first for a matching file path. If a matching path is not found, Package B is searched, using the following mapping rules:
If a file named test.txt exists in the same virtual folder hierarchy in both application packages, the first matching file is used.
If a file named bar.txt exists in the virtual folder hierarchy of one application package, but not in the other, the first matching file is used.