The /stdio qualifier tells KAP to perform strength
reduction on calls to certain functions in the standard I/O library.
Programs that use functions such as printf heavily will
generally have improved I/O performance when this is done.
The /scalaropt=3 qualifier is required when
you use /stdio with standalone KAP, described
in Section 2.7 and Section 3.2. Additionally, you must specify the linker
qualifier, SYS$COMMON:[SYSLIB]kio/lib , when you link
your program.