TOGGLE TO TOPMOST
TOGGLE ( c-addr charmask -- )  
<PFE-MISC>
toggle the bits given in charmask, see also SMUDGE and = UNSMUDGE 
 example: the fig-style SMUDGE had been defined such
   : FIG-SMUDGE LATEST >FFA (SMUDGE#) TOGGLE ;

reference: p4_toggle in ../src/misc.c:0165, export CO TOGGLE