cl question

i was working on the cl part of my job and came up with a few
questions. this is my cl pgm so far based on a layout i have, a few
changes ought to be necessary i think.

PGM PARM(&OBJ &LIB &OK)            
DCL &OBJ *CHAR 10                  
DCL &LIB *CHAR 10                  
DCL &TYPE *CHAR 6                  
DCL &OK *CHAR 1 'Y'                
CHKOBJ &LIB/&OBJ &TYPE             
MONMSG CPF0000 EXEC(CHGVAR &OK 'N')
ENDPGM                             

anyway, my question is how, how does this cl pgm know
what &OBJ &LIB &TYPE &OK refer to when this cl pgm has to interact
with display files and rpg pgms, etc...

sincerely

Mohammad
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