+.TP 4
+.B Require Password
+Whether the screen saver should lock the screen when it activates.
+.TP 4
+.B Lock After
+If \fIRequire Password\fP is selected, this controls the length of
+the ``grace period'' between when the screensaver activates, and when the
+screen becomes locked. For example, if this is 0:05:00,
+and \fIBlank After\fP is 0:10:00, 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 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 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