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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  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.