The mount command mounts  the  library  disk  on  the  specified
 device  and  defines  a tree of logical names that parallels the
 VMS directory structure on the system disk.

 Format:

      MOUNT ddcu:  [label]

Additional information available:

ParametersLogical namesQualifiers

 ddcu:

 In  the  device  name,  "dd"  specifies  the  device  type,  "c"
 designates  the  controller,  and "u", the unit number, uniquely
 identifies a device on a common controller.

 label

 Specifies the label on the disk being mounted.  Labels can  have
 from  one  to twelve characters.  If you do not specify a label,
 the default is VAXVMSLB4.

 The following system wide logical names  are  created  when  the
 MOUNT  command  is  issued:   ("ddcu" represents the name of the
 library device in the examples below.)

     LIB$SYSDEVICE     =  _ddcu:
     LIB$TOPSYS        =  SYS0
     LIB$SYSROOT       =  _ddcu:[SYS0.]
     LIB$SYSDISK       =  LIB$SYSROOT:

     LIB$ERRORLOG      =  LIB$SYSROOT:[SYSERR]
     LIB$HELP          =  LIB$SYSROOT:[SYSHLP]
     LIB$LIBRARY       =  LIB$SYSROOT:[SYSLIB]
     LIB$MAINTENANCE   =  LIB$SYSROOT:[SYSMAINT]
     LIB$MANAGER       =  LIB$SYSROOT:[SYSMGR]
     LIB$MESSAGE       =  LIB$SYSROOT:[SYSMSG]
     LIB$SHARE         =  LIB$SYSROOT:[SYSLIB]
     LIB$SYSTEM        =  LIB$SYSROOT:[SYSEXE]
     LIB$TEST          =  LIB$SYSROOT:[SYSTEST]
     LIB$UPDATE        =  LIB$SYSROOT:[SYSUPD]

Additional information available:

/WRITE

 Permits writing to the library disk.  This qualifier is intended
 for  use  only when installing optional software and running the
 UETP.  Your library disk should be treated as a read only source
 of   VAX/VMS  components.   By  default,  the  library  disk  is
 write-locked.


                             CAUTION

     Altering  your  library  disk  produces  an  unsupported
     software  configuration  and  may  result  in  incorrect
     system operation.