Many of the menu commands for the jstools applications have keyboard shortcuts, which appear in brackets beside the menu entry. To invoke a keyboard shortcut, hold down whatever the Meta key is on your keyboard, and press the key in brackets. (The Meta key is labelled differently on different keyboards; it may be marked `Meta', `Alt', `Mod', or something else. On current Sun keyboards, it's marked with a little diamond.) You may also need to hold down the Shift key; in jedit, for instance, Meta-s is `Save', but Meta-Shift-S is `Save As...'.
Occasionally, a keyboard shortcut uses the control key rather than (or in addition to) the Meta key. For instance, the `Refresh' command in jbrowser has the command equivalent Control-l (that's a lowercase letter ell). The control key is indicated by a caret, so `^l' after a menu entry means that the shortcut for that command is Control-l. (`^L' would mean that the shortcut was Control-Shift-L. `[^L]' would mean that the shortcut was Meta-Control-Shift-L.)
A few keystrokes have special functions in dialogue boxes. Generally, pressing Return will do the same thing as clicking the default button, often `OK' . (To remind you of this, the default button is displayed with a little sunken rectangle around it.) Pressing Control-c, Control-g, Meta-q, or Meta-period will normally do the same thing as clicking the `Cancel' button.
In the Find and Global Preferences panels, Tab lets you jump from field to field without clicking.
In the File Selector panel (which you typically get from a `Load...' or `Save As...' command, pressing Tab will complete a partially¡typed filename as much as possible, as in Emacs and the tcsh(1) shell.
Custom keyboard commands for editing may be defined in your ~/.tk/textbindings.tcl file, and depending on the application, you may be able to define additional keyboard shortcuts in an application¡specific startup file.
Tk 4.0 Compatibility
If you're trying to use the jstools applications with Tk 4.0, you should be aware that Tk 4.0 deals with the Meta modifier key differently from earlier versions of Tk; under Tk 4.0, Meta may be on a different key than it was under earlier versions, or it may not be on your keyboard at all. You should be able to use xmodmap(1X11) to assign the Meta modifier to a key if necessary.