Gets the current clipboard contents in a specific format, returning #f if the clipboard does not contain data in the requested format.
The format string is typically four capital letters. (On the Macinotsh, only four characters for format are ever used.) For example, "TEXT" is the name of the simple text format. New format names can be used to communicate application- and platform-specific data formats.
See Cut and Paste for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:application:mismatch exception is raised.