What exactly a hybrid can do and can not do - server

[azure] simple question. What exactly a hybrid can do and can not do? I have a Win Server 2019 on premises. Does a hybrid Win Server in Azure acts as a mirrow of my premises server? I have an accounting software running on the premises server and will like to explore how will the azure provides a way for remote clients to access the accounting file using Remote desktop

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Difference between Remote Desktop Services vs Windows Terminal Server vs Remote Desktop Session Host

Could someone explain me the difference between them?
Furthermore I have heard that Windows Terminal Server can be used to deploy software to multiple computers in the network in an organisation by creating a GPO. Could someone give me the steps to do this as well?
Remote Desktop Services is set of different roles that work together to provide VDI or remote app experience to the end user. It has following core architecture components:
RD web access -------------> web page that list available apps to access
RD gateway -------------> allow & block traffic
RD connection broker ------> load balance traffic between session hosts
RD session hosts ----------> these are the servers where applications or VDI are run from
Window Terminal Services is same as RDS. Microsoft renamed it in 2008. Terminal server essential is session hosts: https://learn.microsoft.com/en-us/windows/win32/termserv/terminal-services-is-now-remote-desktop-services
I am not sure about the GPO part

WVD (Windows virtual desktop) vs HVD (hosted virtual desktop)

Hopefully this is correct group to ask that question...
What is the difference between HVD technology and new WVD? My understanding both run in the cloud, provide simplified centralized management, and both support RDS (Remote Desktop Services).
So what is different and what are the advantages of new WVD vs. "old" HVD?
As far as I can tell, Hosted Virtual Desktop (HVD) often referred to as a cloud-hosted virtual desktop, is an interface that delivers applications and data that are stored on a cloud provider’s servers instead of the user’s computer or corporate network also it's known as Desktop as a Service (DaaS) so this is the delivery model or technology, but both are the same, just Microsoft created its own (WVD), like Citrix as well they have another Daas called Citrix Managed Desktops

chat among windows server remote users

I wonder is there any software makes the chat among windows server remote users available? especially windows server 2012 R2. I know there are many software for the chat under a local network, but do not know whether they can be used under the same ip but different users.
We use IPMsg. It's free. It handles attachments as well.

How can i know if someone in the network connected to the SQL Express 2008 on my system

I have installed a SQL Express 2008 Server on my Desktop for some local work. This has mixed authentication. I have enabled TCP/IP connection so that one colleague can connect to this server. However, this exposes the server to everyone in the network. How do i keep track of which PC in the network connected to this server and when ? This would just help me audit the usage of the server.
Well you can get information about current users, sessions, and processes in an instance by using
sp_who;
MSDN Documentation

Can a web site running on Windows Azure connect to a socket hosted outside the Azure cloud?

I am curious if it is possible (as well as how) to connect FROM a website hosted by/in Windows Azure TO an outside server (IP and port) using a TCP socket. I have no ability to change the outside infrastructure, but could change the way I access it - for example, maybe rewriting the request to connect using socket.io or something else (which may or may not solve the problem). But since I already have it working outside of Azure, it would be nice if it was simply a configuration to enable my web site to call to this outside system, which only exposes its functionality through a socket connection. Thanks!