Scan now option is to scan group or bulk of assets for assets data. Each time when a new asset is added, instead of scanning all the assets, you can scan the newly added assets for resource details.
If you have changed the credentials for the assets or if you want to specify the log-in credentials for an asset then select the Change Credentials option under the actions menu and specify the details. Click Save and Scan now button for scanning the assets.
To scan bulk of IT Assets,
Click the Assets tab in the header pane. This opens the assets home page.
Select the IT Assets title under the Assets block. Select the specific IT Asset link. This opens the Assets list view page.
Select the assets to be scanned by enabling the check box. Click the Actions tab -> select Scan Now option. This opens the Scan wizard page with total number of scanned and failed assets. And you can view the asset details in the Resource details page.