Explanation/Reference:
Explanation:
Run logon scripts synchronously
Description
Directs the system to wait for logon scripts to finish running before it starts the Windows Explorer interface program and creates the desktop.
If you enable this policy, Windows Explorer does not start until the logon scripts have finished running. This setting assures that logon script processing is complete before the user starts working, but it can delay the appearance of the desktop.
If you disable this policy or do not configure it, the logon scripts and Windows Explorer are not synchronized and can run simultaneously.
Run startup scripts asynchronously
Description
Lets the system run startup scripts simultaneously.
Startup scripts are batch files that run before the user is invited to log on. By default, the system waits for each startup script to complete before it runs the next startup script.
If you enable this policy, the system does not coordinate the running of startup scripts. As a result, startup scripts can run simultaneously.
If you disable this policy or do not configure it, a startup script cannot run until the previous script is complete.
http://msdn.microsoft.com/en-us/library/ms811602.aspx