The substitutions are not nested and performed in the order that they are defined. The key binding can be overridden or defined in fvwm module configuration. In order to undefine, omit the last argument. FvwmConsoleKey Note that non-meta character is case sensitive. It also accepts Subst configuration.
Users often input long fvwm command repeatedly.
Subst will replace particular input sequence to user defined string. Although the format looks different, it takes Perl regular expression. It just uses single or double quote as the delimiter. Single or double quotes have no difference, although they have to match, and cannot include itself in the string.