HEIDENHAIN MANUALplus 620 Technical Manual page 342

4.2.3 Accessing machine parameters via MP numbers
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In order to reach a certain point in the machine configuration as quickly and
directly as possible, a unique MP number has been assigned to each machine
parameter.
The MP number is shown above the object tree or the table view in the
Parameter: line. The current input value, as well as the parameter's unit of
measure, if there is one, are shown after the MP number:
The MP number consists of a 6-digit number. The key name precedes the
6-digit MP number, and the index number (e.g. for list parameters) is
appended to the MP number. The three parts are each separated by a period.
The MP numbers are permanently assigned to a specific configuration object
or machine parameter, and can occur more than once in the system, for
example in the axis-parameter sets or in the kinematics configuration. The
prefixed key names then serve to distinguish between the numbers.
Structure of an MP number:
HEIDENHAIN Technical Manual MANUALplus 620