I have remote RHEL 7 server. I have Windows laptop. I want to connect to RHEL with UI (X Server). (So far I only have ssh connection using Putty.)
What tool should I use?
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If you just want to display X (client) applications you should consider the Xming X server for windows.
If you want to be able to use the RHEL desktop you can either use a remote desktop based protocol. You will have to enable this on your server (and that is assuming it has the Desktop packages installed).
Another approach is installing a virtual machine manager and run Linux in a VM on your Windows laptop (assuming it is not 15 years old and its performance/memory is enough to do so). That gives you an X server both for running remote programs on the server and for local applications. (At some point you might want to switch and run windows as VM under Linux).