HEIDENHAIN iTNC 530 (340 49x-05) - Manual (Page 656)

656 iTNC 530 with Windows XP (Option)
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Controlling access
Administrators have access to the TNC drives D, E and F. Please note
that some of the data in these partitions is binary encoded, and write-
accesses might lead to undefined behavior of the iTNC.
The user groups SYSTEM and Administrators have access rights to
partitions D, E and F. The SYSTEM group ensures that the Windows
service that starts the control has access. The Administrators group
ensures that the real-time processor of the iTNC receives a network
connection via the iTNC Internal Connection.
You may not restrict access by these groups, nor may you
add groups and prohibit certain accesses by these groups
(in Windows, access restrictions have priority over access
rights).