Understanding: Output Device, Host printer and Destination Host.

Hello, i would like to understand how the host pirnter and destination host work which are configured in spad (spool administration): Output Device, host printer and destination host.

I know that Output device is the name of my printer, i am using unix and i know that i have to configure a unix queue with the same name, that means, if my printer is named printerone on unix i have to configure the queue as printerone.

I need to delete printers configured that are not being used in SAP and in unix queue.

I need to understand how the host priinter and destination host works. please explain me.

sample, if ip address of printer "printerone" is: 180.23.25.24 and it contains and dns printerone.mysite.com , please explain me what host printer mean and what destination host means if i know that a have a queue in unix named "printerone" and ip address is 180.23.24.25 for the following configuration.

Output Device: printerone

Host printer: printerone

Destination Host: localhost

Output Device: printerone

Host printer: other-thing

Destination Host: localhost

Output Device: printerone

Host printer: other-thing

Destination Host: other-thing

Output Device: printerone

Host printer: nothing

Destination Host: localhost

Output Device: printerone

Host printer: nothing

Destination Host: nothing

thanks, skystars.