Currently it should take about 30-40 seconds on average to scan machines on a 100-base LAN. We are looking to improve speed in a future version, but it shouldn\'t take 2-3 minutes per machine unless you\'re scanning a WAN.
I\'m not sure I understand your problem completely, but normally you discover many machines, populating the Primary tab with all of them. Even if you scan just a couple machines, you should still be able to export the entire list, even though most machines haven\'t yet been scanned. You\'ll have many fields with no data, but fields like Operating System should show just fine. This should allow you to see your OS distribution with no problem. In fact you wouldn\'t need to scan any machines to see the OS.
There\'s definitely a way to accumulate scans over time and re-load them. At any time after the Primary tab is populated, before or after scanning, you can save a proprietary file called an \"MRF\", accessible from the File menu under Save As... All related information to each machine will also be saved. When discovering new machines you\'ll want to make sure \"Clear Previous Results\" is turned off under the Discovery/Scan panel. Dragging machines from the Network Browser (the left pane in NEWT) will automatically keep previously discovered machines intact in the Primary tab.
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