XPLINK considerations

If the environment being initialized is to be an XPLINK environment then the first program in the PreInit table must be an XPLINK module.
If there is no entry in the PreInit table or if the first module is a non-XPLINK program, a non-XPLINK environment will be initialized.
It is possible to change the environment from a non-XPLINK to an XPLINK environment when using (call_main). For more information, see (call_main) — invocation for main routine.