This help file describes jprompt version 4.1/4.2.
Copyright and contact information is available in the jstools documentation.
Invoking jprompt brings up a panel displaying text with an entry field for the user to type a response into and OK and Cancel buttons. The windowmanager title will be title. When the user clicks OK, jprompt exits and writes what the user typed to standard output. If the user clicks Cancel, jprompt exits and, by default, writes nothing (except a newline) to standard output.
The value printed on Cancel can be specified, and there are a few other options not mentioned in this document; for full details, see the documentation for j:prompt in the jprompts.tcl library.
Both text and title are localisable.