Sequencing "Attachmate Extra X-treme 9.0" for Windows 7 could be highly annoying without the below tip.
    
The Sequenced application launches with a "Server busy/retry" message every time the Extra session based application shortcut is launched.

Issue: issue is with the Vendor code which is the causative factor for the error.

Solution: Installing the service pack which is available from the vendor at the time of sequencing would fix the error.
     
"Attachmate Extra X-treme 9.0" is on the certified list of applications that run on Windows 7 32 as well as 64 bit OS. The earlier versions of the application DOES NOT run on Windows 7.
     
NOTE: Windows Compatibility list doesn't talk about requirement of the service pack. The list of Windows 7 compatible applications can be found using the below link
      
http://www.microsoft.com/windows/compatibility/en-us/default.aspx