This article describes how to setup two switches in a virtual 3-way. It will allow you to control the same load in multiple locations.
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First, navigate to the association settings of the first switch. In the Homeseer GUI click on the "Light" link of the node, then "Z-Wave", and then "Manage".
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Next, expand the "Associations" menu and click on "Retrieve" or "Update" to pull down the current association info.
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Then select the desired group. In this example we will be using group 3 & 4 and will be setting the associations up both ways. So, for example:
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Switch A:

Group 3 -> Switch B
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Group 4 -> Switch B
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Switch B:
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Group 3 -> Switch A
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Group 4 -> Switch B
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Select "Group 3" from the drop down, then the other device from the "Device to be Controlled" drop down, and lastly click on "Add Association".
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Repeat the steps for Group 4.
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Next, we will do the same on the second switch. So click "Back" and then the "Devices" link to get back to the main devices page.
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Find the second switch in the list and click on "Light", then "Z-Wave", and then "Manage".
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Next, expand the "Associations" menu and click on "Retrieve" or "Update" to pull down the current association info.
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Note: Make sure that the correct "Node Number" is selected before proceeding.

Select "Group 3" from the drop down, then the other device from the "Device to be Controlled" drop down, and lastly click on "Add Association".
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Repeat the steps for Group 4.
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The last step is to change the Configuration parameter of one of the switches so that it mirrors its received commands to the other switch. We need to make sure that we only do this on one switch or else you will create a loop of z-wave commands that will cause problems on the network.
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Choose the first switch. Usually this will be the "master" with the load attached to it. When you send Z-Wave commands to the virtual 3-way it will, in-turn, control the other switch.

From the "Devices" page click on the desired device "Light", then "Z-Wave", and then "Manage".
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Expand the "Settings" section and set "Parameter Number 59" to "3" and then click on "Set".
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That's it! You should now be able to control the load locally from either switch. Also, changing the level of the "Master" switch via Homeseer should also change the level of the other switch!
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