To enable VM management feature we can install NGT on user VM’s 

To use the NGT feature, you must do the following:

1. Enable the NGT feature for a VM in the Prism Element web console. 

2. When you enable NGT for a VM, Prism Element prepares the VM so that NGT can be successfully installed and used in that VM.

3. Mount the NGT installer (ISO disk file) in a VM.

4. Install NGT in a user VM.

• Few requirements we need to take care of:

1. The following ports must be open between the Controller VMs and guest VMs on which NGT is installed:

2. Controller VM: 2074. TCP port 2074 must be open in the Controller VM, so that user VMs can communicate with the Controller VM.

3. User VM: TCP port 23578 if you want to use the VSS service.

For further details about NGT and its working please refer following links

https://next.nutanix.com/how-it-works-22/nutanix-guest-tools-37346

https://portal.nutanix.com/page/documents/details?targetId=Web-Console-Guide-Prism-v55:man-nutanix-guest-tool-c.html