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| 5.1 $DEVICE | $IO device status. | |
| 5.2 $DIALECT | Current M dialect. | |
| 5.3 $ECODE | Latest M error code. | |
| 5.4 $ESTACK | Error stack info. | |
| 5.5 $ETRAP | Standard error handler code. | |
| 5.6 $HOROLOG | Current date and time. | |
| 5.7 $IO | Current I/O device. | |
| 5.8 $JOB | PID of current process. | |
| 5.9 $KEY | Characters terminating last READ command.
| |
| 5.10 $PDISPLAY | Current primary MWAPI display. | |
| 5.11 $PRINCIPAL | I/O channel of terminal. | |
| 5.12 $REFERENCE | Most recent global reference. | |
| 5.13 $QUIT | Whether a QUIT command requires an argument in the current execution context.
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| 5.14 $STACK | Current program execution stack level. | |
| 5.15 $STORAGE | Number of bytes available in the heap. | |
| 5.16 $SYSTEM | MDC system ID of FreeM. | |
| 5.17 $TEST | Truth value of last conditional expression or result of certain LOCK operations.
| |
| 5.18 $TLEVEL | Current level of transaction nesting. | |
| 5.19 $WITH | Current variable prefix set by WITH command.
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| 5.20 $X | Current horizontal screen position. | |
| 5.21 $Y | Current vertical screen position. | |
| 5.22 $ZA | Current position of file on $IO.
| |
| 5.23 $ZB | Most recent keystroke. | |
| 5.24 $ZCONTROLC | Control-C handling flag. | |
| 5.25 $ZDATE | Current date in locale-specific representation. | |
| 5.26 $ZERROR | Last error message. | |
| 5.27 $ZHOROLOG | Date and time, including milliseconds. | |
| 5.28 $ZINRPT | State of the interrupt enable/disable flag. | |
| 5.29 $ZJOB | PID of parent process, if applicable. | |
| 5.30 $ZLOCAL | Last local variable reference. | |
| 5.31 $ZNAME | Name of current M routine. | |
| 5.32 $ZPRECISION | Digits of arithmetical precision. | |
| 5.33 $ZREFERENCE | Last gvn referenced. | |
| 5.34 $ZSYSTEM | Return value of last external command. | |
| 5.35 $ZTIME | Current time in locale-specific representation. | |
| 5.36 $ZTRAP | Entryref to be executed on error condition. | |
| 5.37 $ZUT | Microseconds since the UNIX epoch. | |
| 5.38 $ZVERSION | Version of FreeM and GNU host triplet. |
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