Published application stops operating while switching focus to local one

Symptoms

• A published application is not operating correctly in case you switch focus to some local resource
• In some of the cases pressing ALT key may cause the same issue

Cause

Misconfiguration

Resolution

Some proprietary applications may require additional configuration.

1. Take a note of the executable file of the problematic published app (e.g. TestApp.exe)
2. On every RDSH/VDI/RemotePC from which the application is published, do the following: 

• Create registry key HKLM\SOFTWARE\Wow6432Node\Parallels\Memshell (for 32bit OS, use HKLM\SOFTWARE\Parallels\Memshell)
• Create the string DisableAltOnDisactivate with the value that equals the name of the executable in question ( you may specify several apps separated by semicolon, e. g. TestApp.exe;Application1.exe;Application2.exe;Application3.....)

3. Check the issue from Parallels Client.

Note: No reboot is necessary, to apply the changes, an end user must log off from RAS Session.