Abbreviation | Full name  | Explanation  | 
  | 
  | 
  | 
PPR | Page Printer Requester  | Enhanced version of  | 
  | 
  | LPR/LPD. The  | 
  | 
  | enhancement enables bi-  | 
  | 
  | directional  | 
  | 
  | communication when  | 
  | 
  | printing. Not part of the  | 
  | 
  | standard TCP/IP stack  | 
  | 
  | (programs). Used by ida  | 
  | 
  | PSS, ida HPR and PSF.  | 
  | 
  | Works only in conjunction  | 
  | 
  | with PPR. The sender of a  | 
  | 
  | print job via TCP/IP will  | 
  | 
  | be PPR and the receiver  | 
  | 
  | will be PPD.  | 
  | 
  | 
  | 
PSF | Print Service Facility  | IBM printer driver for AFP  | 
  | 
  | printing. Converts line  | 
  | 
  | data and AFP data to  | 
  | 
  | IPDS only. PSF/AIX and  | 
  | 
  | PSF/2 is capable of  | 
  | 
  | converting the data to  | 
  | 
  | PCL as well.  | 
  | 
  | PSS (ida PSS) Print  | 
  | 
  | Subsystem Print  | 
  | 
  | system for OS/390 (MVS)  | 
  | 
  | and VM systems. Prints  | 
  | 
  | AFP and line data files on  | 
  | 
  | all remote printers, NOT  | 
  | 
  | channel attached  | 
  | 
  | printers.  | 
  | 
  | 
  | 
RAM | Random Access Memory  | Memory chip that is able  | 
  | 
  | to store information while  | 
  | 
  | powered on. RAM can be  | 
  | 
  | ‘written’ an indefinite  | 
  | 
  | number of times.  | 
  | 
  | 
  | 
SCS | SNA Character String  | Control information for  | 
  | 
  | simple print formatting  | 
  | 
  | like e.g. set CPI, LPI and  | 
  | 
  | Form Feed.  | 
  | 
  | 
  | 
SIMM | Single Inline Memory  | 
  | 
  | Module  | 
  | 
  | 
  | 
  | 
SNA | Systems Network  | IBM networking concept  | 
  | Architecture  | usually for Mainframe and  | 
  | 
  | AS/400. On mainframes  | 
  | 
  | the actual program that  | 
  | 
  | implements SNA is called  | 
  | 
  | VTAM.  | 
  | 
  | 
  | 
39