# Device environments

Each device in system is created with specific environment, this enables to behave sessions related to given device in certain ways.

List of system defined device environments:

<table><thead><tr><th width="201">Environment name</th><th width="323">Description</th><th width="238.33333333333334" data-type="checkbox">Is sale environment</th></tr></thead><tbody><tr><td><code>BackOffice</code></td><td>Used for PORTOS BackOffice application.</td><td>false</td></tr><tr><td><code>CashRegister</code></td><td>Used for PORTOS Cash register application (PORTOS Pokladňa)</td><td>true</td></tr><tr><td><code>PDA</code></td><td>Used for PORTOS Mobile cashier smartphone application (PORTOS Mobilný čašník)</td><td>true</td></tr><tr><td><code>Tool</code></td><td>Used for all other devices, such as PORTOS Link.</td><td>false</td></tr></tbody></table>

## Sale environment

`CashRegister` and `PDA` environments are so called "*sale environments*".

Sale environments are specific in several ways:

* each "sale environment" device can hold up to one active session at the time. That means, if user is authenticated in cash register device and another request for authorization on same device is invoked, the earlier session is terminated by API.&#x20;
* some API actions (mainly related to ticket updating) are allowed only for users authenticated on sale environment devices.


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