When we launch an application, a progress bar is seen. In some cases, user might require to hide it as it might overlay some important information. eg. second authentication required to launch the application.

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Instructions

In such cases we can run the Application Progress Bar as back ground process, applicable only after Receiver 4.1. This would launch the Application Progress Bar in minimized state.

In order to run the Application Progress Bar as a background process, do the below registry changes.

For Windows 64-bit systems: 
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\ICA Client 

For Windows 32-bit systems: 
HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\ICA Client 

Name: ForegroundProgressBar 
Type: DWORD 
Data: 0 

Note: 0 means background and 1 means foreground

Follow the below steps to set registry key value from Group Policy: 
1. Open the Group Policy Management Console 

2. Right click Group Policy Objects and select New, give the GPO a meaningful name, this does not link it to an OU so will not affect any computers or users. 

3. Right click the New GPO, and select edit 

4. Expand one of the below depending how to want to apply the setting computer/user
Computer Configuration > Preferences > Windows Settings and head down to Registry. Right Click and select 'New', then select 'Registry Item' 
or
User Configuration > Preferences > Windows Settings and head down to Registry. Right Click and select 'New', then select 'Registry Item' 

5. Browse the 'Key Path' select the required 'Key' 

6. Set the value to 0 (zero). 

Note: 
In order to push client side registry settings from the GPO, we need install Receiver on the server (from where you are pushing the Group Policy) so that the registry is available on the server. 
 

Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

http://support.citrix.com/article/CTX138197