# System components

| [tRunJob](https://help.qlik.com/talend/en-US/components/8.0/system/trunjob) | Manages complex Job systems which need to execute one Job after<br>another. |
| --- | --- |
| [tSetEnv](https://help.qlik.com/talend/en-US/components/8.0/system/tsetenv) | Adds variables temporarily to system environment during the execution of a<br>Job. |
| [tSSH](https://help.qlik.com/talend/en-US/components/8.0/system/tssh) | Establishes a communication with distant server and returns securely sensible<br>information. |
| [tSystem](https://help.qlik.com/talend/en-US/components/8.0/system/tsystem) | Calls other system processing commands, already up and running in a larger<br>Job. |