Quotes are required only when needed to make fvwm consider two or more words to be a single argument.
Unnecessary quoting is allowed. If you want a quote character in your text, you must escape it by using the
backslash character. For example, if you have a pop-up menu called “Window-Ops”, then you do not need

Popup Window-Ops

but if you replace the dash with a space, then you need quotes:

Popup “Window Ops”

The supported quoting characters are double quotes, single quotes and reverse single quotes. All three kinds
of quotes are treated in the same way. Single characters can be quoted with a preceding backslash. Quoting
single characters works even inside other kinds of quotes.