You have several options – I suggest that you use a combination of all three, if possible;
1. Do a selective install on the desktop. By default, only a limited set of Operations Navigator (now called iSeries Access) is installed. You have to consciously choose to install a full set of functions. This is not fool-proof, however, because full installations of OpsNav could be obtained from the iSeries if there is a file share to that directory.
2. Use Application Administration -- this is a function of OpsNav -- click on the system name and on the Connection Tasks box at the bottom of the window you'll see Configure Application Administration. This allows you to determine what OpsNav functions users will see on their desktop. This is more or less 'smoke and mirrors' however because the code (or the functionality) is still installed on the PC. However, the users will not see the functions when they open up the OpNav functions. It's a pretty effective method for implementing the "out of sight -- out of mind" theory.
Implement object security. This will help the situation because users will only be able to perform the functions they are authorized to perform.
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This was first published in August 2004