Window services

Callable window services enables assembler language programs to use the CALL macro to access data objects. By calling the appropriate window services program, an assembler language program can:

Read or update an existing permanent data object
Create and save a new permanent data object
Create and use a temporary data object

Window services enable your program to access data objects without your program performing any input or output (I/O) operations. All your program needs to do is issue a CALL to the appropriate service program. The service performs any I/O operations that are required to make the data object available to your program. When you want to update or save a data object, window services again performs any required I/O operations.