Syntax: PushPrefs [n]
Abbreviation: PUSHP
pushes n copies of the user preferences onto a stack. If
not specified, n defaults to one. Use the PopPrefs command
to pop preferences off the stack and restore the values. See PopPrefs. Note that the
preferences stack is global, not buffer-specific, so you could
PushPrefs one buffer's preferences, switch buffers, then
PopPrefs those preferences, thereby altering the preferences for
the second buffer. The maximum preferences stack depth is 32.
   
PushPrefs and PopPrefs are useful in macros that require
certain preferences to work properly.  A macro can PushPrefs,
change any preferences necessary, do its work, then PopPrefs to
restore the users previous preferences settings.
PushPrefs saves the following values on the preferences stack:
       AutoIndent  DelTabs   NoFileReq    StatusBar  VisualBell
       AutoPrefs   DoUndo    PreserveCR   ShiftTabs  WordWrap
       Binary      FreeForm  ReadOnly     Tabs
       CaseSearch  HexCode   RightMargin  TabSize
       ClipNumber  Insert    SearchBack   UTF8Auto