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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.