I'm still new to this myself, but I've done this by setting up a subdomain containing the servers I want to give access to, getting the other people to set up their own account, and then giving them the permissions to access the subdomain,
Check this post here for more info on restricted properties - http://www.gamecreate.com/forum/viewtopic.php?t=1786
You can use a local content server (see Download link on the left) to host the content locally on your LAN to control and vastly improve download speeds.
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