The IBM.OBJECT environment variable specifies the output directory for object and definition files which have the same name as your source program file, with an extension of OBJ or DEF. For example:
set ibm.object=c:\pli\project\updates
An object file contains the machine code translation of your PL/I source statements. To make it executable, you must link it with any other OBJ files that comprise your program, and with appropriate library files. For a summary of how to link your program, see Linking your program.