combo                   Combobox to manipulate a string variable by
                        offering a list of alternative expressions
entry                   Text entry field to manipulate a string
                        variable
filer                   File selection dialog to manipulate a string
                        variable denoting a filename
knob                    Knob to manipulate a real valued variable
print.twiddlerControl   Display information about a twiddler control
shortenString           Shorten a string if it is longer than a limit
toggle                  Checkbox to manipulate a logical variable
twiddle                 Interactive manipulation of R expressions
twiddle_print           Print, then directly flush the output buffer
unboundVariables        Find the unbound variables of an R expression
