+.TP 4
+.B Lock Screen
+When this is checked, the screen will be locked when it activates.
+.TP 4
+.B Lock Screen After
+This controls the length of the ``grace period'' between when the
+screensaver activates, and when the screen becomes locked. For
+example, if this is 5 minutes, and \fIBlank After\fP is 10 minutes,
+then after 10 minutes, the screen would blank. If there was user
+activity at 12 minutes, no password would be required to un-blank the
+screen. But, if there was user activity at 15 minutes or later (that
+is, \fILock Screen After\fP minutes after activation) then a password
+would be required. The default is 0, meaning that if locking is
+enabled, then a password will be required as soon as the screen blanks.
+.TP 4
+.B Preview
+This button, below the small preview window, runs the demo in full-screen
+mode so that you can try it out. This is the same thing that happens when
+you double-click an element in the list. Click the mouse to dismiss the
+full-screen preview.
+.TP 4
+.B Settings
+This button will pop up a dialog where you can configure settings specific
+to the display mode selected in the list.
+.SH ADVANCED TAB
+This tab lets you change various settings used by the xscreensaver daemon
+itself, rather than its sub-programs.
+.TP 4
+.B Grab Desktop Images
+Some of the graphics hacks manipulate images. If this option is selected,
+then they are allowed to manipulate the desktop image, that is, a display
+mode might draw a picture of your desktop melting, or being distorted in
+some way. The security-paranoid might want to disable this option, because
+if it is set, it means that the windows on your desktop will occasionally
+be visible while your screen is locked. Others will not be able
+to \fIdo\fP anything, but they may be able to \fIsee\fP whatever you
+left on your screen.
+.TP 4
+.B Grab Video Frames
+If your system has a video capture card, selecting this option will allow
+the image-manipulating modes to capture a frame of video to operate on.
+.TP 4
+.B Choose Random Image
+If this option is set, then the image-manipulating modes will select a
+random image file from disk, from the directory you specify in the text
+entry field. That directory will be recursively searched for files,
+and it is assumed that all the files under that directory are images.
+
+If more than one of these options are selected, then one will be chosen at
+random. If none of them are selected, then an image of video colorbars will
+be used instead.
+
+(All three of these options work by invoking the
+.BR xscreensaver\-getimage (1)
+program, which is what actually does the work.)
+.TP 4
+.B Verbose Diagnostics