IBM Professional Series User Manual page 379

CMS Initialization
When you start (IPL) CMS, you may pass a parameter
on the command line. If you specify the environment on
the logon screen or in the autoipl configuration option,
the system will pass the parameter 'AUTOIPL'.
VM/PC CMS does not prompt you for a first command,
as VM/SP Release 2 eMS does. The initialization of
CMS continues, uninterrupted by a prompt.
The initialization of CMS involves accessing the' 100'
minidisk as your S disk. Only the mode 2 files will be
accessed. The initialization of CMS then checks to see if
an exec called 'SYSPROF EXEC' exists on this S-disk.
If
it does, the command 'EXEC SYSPROF' is executed
and the parameter passed to CMS on the IPL command
is passed to this exec.
The SYSPROF exec checks for the parameter
'NOSPROF', which you specify if you don't want the
system profile to be executed.
If
you specify
'NOSPROF', the exec ends without doing anything else.
Otherwise, the exec issues the command 'SET OSSIM
ON' to start OS Simulation, and sets the system
synonyms from the file 'SYSTEM SYNONYM' on the
S-disk.
If you have a minidisk defined at address 'I 0 I " that disk
is accessed as your A-disk.
If
you have a minidisk
defined as 'IDE', that disk is accessed as your Y-disk.
Unlike VM/SP Release 2, the Y disk will not be
selectively accessed.
If
you specified the keyword 'NOPROF' on the IPL of
CMS, your user profile is not executed.
If
you didn't
specify 'NOPROF', the file 'PROFILE EXEC' is
executed. The parameters you used to start CMS are
passed to your profile exec, where you may test for
special keywords.
This initialization is similar to the way VM/SP Release 2
initializes, although it is not identical. The initialization
C-2 VM/PC Users Guide