Here is what they mean:
Last Antivirus Updates Scan Date
Last Blocked Application Scan Date
Last Compliance Scan Date
Last Custom Definition Scan Date
Last Driver Updates Scan Date
Last Security Check Date
Last Software Updates Scan Date
Last Spyware Scan Date
Last Update Scan Date
Last Vulnerability Scan Date
All of the above relate to Security and Patch Management. Each is a specific type of content which is why you may not have entries for all of the items. The date displayed depends on whether you have configured your vulnerability to scanner to run regularly. If your Update Scans are not occurring then you are not regularly checking your clients to see if they need LANDesk patches.
Last Hardware Scan Date
Last Software Scan Date
These are for the inventory scanner. It can send a full scan covering both hardware and software or just a hardware scan. these dates and times are taken from the client machine. Beware if you do not have good time synchronisation as these dates and times may be misleading.
Last Updated by Inventory Server
last time some kind of inventory scan was received by the core server. The time shown here is the time stamped by the core server when the data is processed. Useful in multi-timezone, if times are not sync'd or if you have a large backlog of scans during the day.
The inventory ones are the ones that tell you if normal inventory records are updating. the vulscan ones are very important if you use LANDesk for patching etc as they will indicate if your security scans are running correctly.
Hope this helps.
Mark Star - MarXtar LANDesk Enhancements
Home of Power State Notifier & Wake-On-WAN for LANDesk