# Object key

An object key consists of a prefix, which defines the object type, and an object ID which is unique within the object type ( = ID or internal ID).

### Prefix

The prefix is unique and defined for each object type (cannot be changed). It consists of a 2-letter abbreviation.

### ID

The ID can be defined for the respective object in the HS/FS Expert. It is not case-sensitive.
When used, it must be appended to the prefix followed by an '@' character.

### internal ID

The internal ID is automatically assigned and cannot be changed.
When used, it must be appended to the prefix followed by an ':' (colon).

### Examples

A communication object with the ID 1_1_1 and the internal ID 47 could be addressed as follows:

- CO@1_1_1 - Object key for the communication object with the ID 1_1_1

  or

- CO:47 - Object key for the communication object with the internal ID 47