It depends a lot on what exactly it is that you’re trying to find out.
You can find out which licensed products are installed on your system by using GO LICPGM and then selecting option 10 to Display Installed Licence Programs, alternatively you can use the DSPSFWRSC (Display Software Resource) command to see pretty much the same information.
Licensed programs are primarily those provided by IBM, although some software suppliers do install their products using the licensed program API’s and they will appear in the list. Others (most), however, don’t and you’ll need to either revert back to documentation or do some investigation using tools such as PDM to find which libraries have been installed on the box and what they are used for.
To find out what is actually running then you are looking at using the WRKACTJOB (Work with Active Jobs) to find which jobs are currently active, although you will need to do some research to find out exactly what each of the IBM Qxxxxxxxxx jobs is actually doing.
If you’re looking to delve further and find out which TCP/IP services are running then you can use the NETSTAT command and then take option 3 to see which ports are being listened on. That’ll give you an idea of whether or not things like the FTP and Web servers are running.
Hope it helps