Really fast method to check if host is online???

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I have a list of pc names that I need to go out and pull information
from. If they are all online, great! But when a PC is turned off (not
online), the program hangs for a good 40 seconds before moving on. Is
there a way for me to quickly see if a host is online or not? I'm
hoping for something less than 5 seconds per host.

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