Need suggestion on Printer in oracle apps

Hi All,

I am new to this forum.

I have few questions.
1) What is CUPS/IPP printer? and uses
2)What is LPD, PPD, we are using lpd://hbgprint1.test.local/PO%20HPLJ1320
What is lpd here , uses?
3)How to know the printer is setup with CUPS?

Thanks,
Rajesh