Can we run the unattended bot without orchestrator? Like i want to run the unattended bot from robot tray manually is it possible?

I have run the attended bot from robot tray . Now i have new scenario like if we have only unattended bot only can we run unattended bot manually from robot tray?

yes it is possible, all depends according to the project and client requirements

How it will login to Remote desktop i mean these settings we usually save in orchestrator when creating unattended bot.

My scenario is user will run the bot from robot tray from one machine and bot will login to another remote desktop and perform task. how will it login to another remote desktop i mean where we have to set credentials of remote desktop login