Specifies one or more characters to be used for the CONCAT operator in addition to REXX's default, which is "||". 
                  	  
               
            
 
            	 
             
               		 
               	 
            
 
            	 
            
               Syntax:
 
               		 
               		MFREXX_CONCAT=character-specification
 
               	   
            	 
            
               Parameters:
 
               		 
               		
                
                  		
                  
                      
                        			  
                        			  
                        			 
                         
                           				
                            
                              				  
                              | character-specification | One or more characters for each operator; each character you specify is used in addition to the default operator. Each additional
                                 character must be defined within single or double quotes, or in hexadecimal. Separate multiple characters with a space or
                                 a comma. | 
 
                           			 
                         
                        		  
                     
                    
                  		
                 
               	 
              
            	 
             
            	 
            
               Comments:
 
               		 
               		
                Any error in the specification of the additional characters, including the specification of alphabetic or numeric characters,
                  results in the environment variable being ignored.