tt(IFSTREQUAL) tests for the equality of two strings. It expects
four arguments: two strings to match, a true list and a false list. The
true list is only evaluated when the contents of the two string arguments
exactly match. 

    The first two arguments of tt(IFSTREQUAL) are partially evaluated:
    itemization(
    it() If the argument is the name of a symbol, the symbol's value is the
value of the argument
    it() Otherwise, the argument itself is used.
    )

In the degenerate case where the string to be compared is actually the name of
a tt(SYMBOL), use a temporary tt(SYMBOL) variable containing the name of that
symbol, and compare it to whatever you want to compare it with. Alternatively,
write a blank space behind the arguments, since the arguments are then
interpreted `as is'. In practice, the need for these constructions seem to
arise seldom, however.

    Example:
        verb(
    IFSTREQUAL(MYSYMBOL)(Hello world)(
        The symbol `MYSYMBOL' holds the value `Hello world'
    )(
        The symbol `MYSYMBOL' doesn't hold the value `Hello world'
    )
        )
