Click Signatures to display the Method Signature dialog shown in Method Signatures dialog. This dialog lists the signatures for the methods defined on the current generic function. The signatures of a method are the types of the arguments that each method defined takes.
Figure 12.3 Method Signatures dialog
To list the method combinations of any defined method in the generic function browser, select its signature from the list in the Signatures panel and click OK .
You can also manipulate the signatures displayed using the Restricted Class panel. See Performing operations on signatures for details.