I was recently frustrated by my remote working provision where I couldn’t use common Windows shortcuts such as the Winkey-D to minimize all open windows or alt+tab to cycle between windows.
Fortuantly there is a workaround for this, simple edit this:
HKEY_LOCAL_MACHINE \SOFTWARE\Citrix\ICAClient\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Keyboard\TransparentKeyPassthrough
or in Windows 7 x64
HKEY_CURRENT_USER\SOFTWARE\Citrix\ICAClient\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Keyboard\TransparentKeyPassthrough
Set the value to be Remote and restart your connection