The package uses collectbox to define variants of common box related macros which read the content as real box and not as macro argument. This enables the use of verbatim or other special material as part of this content. The provided macros have the same names as the original versions but start with an upper-case letter instead. The long-form macros, like \Makebox, can also be used as environments, but not the short-form macros, like \Mbox. However, normally the long form uses the short form anyway when no optional arguments are used.