| Keyword | Description | Symbol / Usage |
| _ack | Print acknowledgement (ACK:) messages (document scope) | _ACK |
| _begin | Define begin tag for the document | _BEGIN |
| _doc | Document level command initiator | _DOC |
| _echo | Echo expression in output (document scope) | _ECHO |
| _end | Define end tag for the document | _END |
| _noack | Supress acknowledgement (ACK:) messages (document scope) | _NOACK |
| _noecho | Supress echoing expression in output (document scope) | _NOECHO |
| _noresult | Supress result of the expression in output (document scope) | _NORESULT |
| _nosilent | Evaluate expression and respond normally (document scope) | _NOSILENT |
| _noskip | End skipping of expressions in the document | _NOSKIP |
| _notrace | Supress memorizing document variables | _NOTRACE |
| _result | Print result of the expression in output (document scope) | _RESULT |
| _silent | Evaluate expression silently (document scope) | _SILENT |
| _skip | Skip expressions in the document, treat as comments | _SKIP |
| _trace | Memorize document variables | _TRACE |
| ack | Print acknowledgement (ACK:) messages (expression scope) | ack |
| echo | Echo expression in output (expression scope) | echo |
| noack | Do not print acknowledgement (ACK:) messages (expression scope) | noack |
| noecho | Supress echoing expression in output (expression scope) | noecho |
| noresult | Supress result of the expression in output (expression scope) | noresult |
| nosilent | Evaluate expression and respond normally (expression scope) | nosilent |
| result | Print result of the expression in output (expression scope) | result |
| silent | Evaluate expression silently (expression scope) | silent |