In dL4, by default, the BP/EP operations take effect only when format mode is enabled by the 'FM' mnemonic. As in IRIS, the preferred way of using protected mode is to output all protected fields with format mode off ('FX'), and then output 'FM' when finished. The FM/FX mnemonics were not mandatory in the IRIS/UniBasic environment, but their use was recommended (see IRIS R9 Business Basic Manual, p. 3-31). Many UniBasic users combined 'BP' and 'FX' mnemonics as a single 'BP' mnemonic in their term files for BITS program compatibility. Similarly, they combined 'EP' and 'FM' as a single 'EP' mnemonic in their term files. This behavior can be duplicated in dL4 for Unix by adding the line "BPIsFXBP=True" to the "[Settings]" section of the terminal description files.