VMS Help  —  Sys Files, [SYSEXE]  USB$UCM_DEVICES.DAT
   Contains entries that describe a keyboard and a mouse that will work
   any place on the USB bus. The UCM Server process will create a
   node-specific copy of this file.  The copy in SYS$COMMON:[SYSEXE]
   should not be deleted.  These files should never be edited by a user.
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