All functions are prefaced by "ZipIt." (e.g.; ZipIt.add ("My Drive:My File")).

add (file) ÇAdds a file to the frontmost window.
addComment (s) ÇAdds (or replaces) a comment for the entire Zip file.
closeWindow (save) ÇCloses the frontmost window.  Save is 'yes ', 'no  ', or 'ask '.
compress (to) ÇZips the front window.
extract (into, filelist) ÇExtracts all selected entries in the archive.
newWindow () ÇTells ZipIt to open a new, untitled window.
openApplication () ÇLaunches ZipIt at path specified in appInfo.path.
openDocument (file) ÇOpens ZipIt with specified document.
printDocument (file) ÇPrints specified document with ZipIt.
quitApplication () ÇQuits
selectAll () ÇSame as choosing ÒSelect AllÓ from the Edit menu.
translateBinhex (file) ÇConverts the specified BinHex file into a normal Macintosh file.