If there is some variable from the user's password, I want the password that the user has entered for the wordpress account, to send to another server, so that the user can also log on to another server with the same data as on the wordpress, is there anyone a solution for this? thank you all for help
WordPress is not storing the password in the database in the readable format, so you can't simply get the password for any user. Passwords are stored in the hashed format, and they can't be reversed back to a readable format.
This has been discussed before, there are a number of options such as Wordpress Multisite installations which can handle this for you.
Or have a read of this solution : Share login data/cookies between multiple installations