This variable is used only in UniKix environments, and the UniKix application automatically sets this variable to 1 (TRUE). When set to 1 (TRUE), an OPEN OUTPUT statement will cause the EXTFH functions to bypass the "make" process, and will open the file as OUTPUT. When set to 0 (FALSE), or not set at all, the EXTFH functions will execute the "make" process, and will open the file as EXTEND.