| unique-command-name | Find unique command name, beginning with prefix. |
| setenv | Set environment parameter value |
| getenv | Return environment parameter value, or default if not set |
| unsetenv | Unset environment parameter |
| setglobal | Set global variable value |
| getglobal | Return global variable value, or default if not set |
| unsetglobal | Unset global variable |
| hostname | Return host name |
| hosttype | Return key for the operating system type |
| username | Return full user name |
| let | C assignments |
| geturl | get a document from a specified url |
| tcp | replaces the libtclTCP procedures, using built-in socket command |
| TcpClient | class for connecting to Tcp server |