It could be designed to do almost anything. For example it can provide a very flexible and generic interface to IBM i command like this:

     WRITE and READ the 5250 screen containing PGMNAME, REQUEST_TYPE and COMMAND
      
     DOWHILE (REQUEST_TYPE not equal "SIGNOFF")
    
          CASE of REQUEST_TYPE
              WHEN = "CMD"    CALL QCMDEXEC (COMMAND 256)
              WHEN = "CALLP3" CALL PGM_NAME using calling protocol 3 for parameters   
              <etc>

Would allow your RAMP scripts to execute a CL command like this:

     NAVIGATE_TO_JUNCTION("SJP");
     SETVALUE("REQUEST_TYPE","CMD");
     SETVALUE("COMMAND","WRKSBMJOB *JOB")
     SENDKEY(KeyEnter);

Or  

     NAVIGATE_TO_JUNCTION("SJP");
     SETVALUE("REQUEST_TYPE","CMD");
     SETVALUE("COMMAND","SBMJOB(BATCH) CMD("CALL PRINTORDER")")
     SENDKEY(KeyEnter);

The 5250 screen used to communicate between a RAMP script and a SJP is really more of program data structure that a real 5250 screen that a user would ever see.