This switch controls whether or not certain assembler keywords (reserved words) may be used in the context of a code label (for example, TEST:). By default, this switch is off, and keywords may not be used as labels.
Even when this switch is turned on, there are severe restrictions on this capability. Processor mnemonics classify as the only "keywords" allowed in this situation, and only in the context of a code label (a label followed by a colon); using any reserved word as a directive name or data label is illegal.
┌────┬──────┬─────┬────┬──────────────────────────────────────────────────┐ │Type│Global│Group│File│Default │ ├────┼──────┼─────┼────┼──────────────────────────────────────────────────┤ │S │Yes │Yes │Yes │-Sk (Reserved words may not be used as labels) │ └────┴──────┴─────┴────┴──────────────────────────────────────────────────┘