I did a search of apt and found the package xkbset. The description includes this:
Quote:
Description: Small utility to change the AccessX settings of XKEYBOARD
AccessX is a set of features within the XKEYBOARD extension of the
X Window System designed to make X more accessible to users with
disabilities. XKEYBOARD is present in X11R6.1 and later. AccessX features
are typically unknown, given that in many implementations no interface
is provided to utilize their functionality.
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It goes on to list the various functions acessX has, including mousekeys, slowkeys, stickykeys, etc. So yes, it's a part of the X window system. FYI, XFREE86 was the version of X that most distros used for many years, but the project has since been forked due to licensing changes (among other factors) and Xorg has taken over as the standard version. Almost nobody uses xfree86 anymore except for legacy systems. But both should include accessX.
Not sure if xkbset will help you, but if you haven't tried it already, you might give it a shot. (
xkbset homepage)
You can read more about the history and structure of the
X Window System on Wikipedia.