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System Debug provides a large collection of predefined environment variables,
the names of which are reserved and may not be replaced by user-defined
variables with the VAR and LOC commands.
Several environment variables provide access to the current System Debug
execution environment. Examples of these variables include the current input
radix and the prompt string. Other environment variables are used to access
key components of the state of the machine being examined. For example, all
of the machine registers defined in the HP 3000 and HP Precision Architectures
are available as environment variables. Subject to the context of use, some of
these variables may be set by the user with the ENV command. The
environment variables that correspond to the CM and NM machine registers are
also accessible through the MR (modify register) and DR
(display register) commands. All environment variables may be read (accessed)
as expression operands. Some environment variables also require privileged
mode for modification access.
The ENV command in chapter 4 gives a detailed description
of each of the predefined environment variables and specifies which
ones may be modified and which ones are read-only.
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