operators
Classes 
PSAbs
PSAdd
PSArc
PSArct
PSClear
PSClosepath
PSCurrentpoint
PSDeq
PSDiv
PSDup
PSEq
PSExch
PSExit
PSFor
PSGe
PSGet
PSGt
PSIdiv
PSIf
PSIfelse
PSIndex
PSLe
PSLength
PSLineto
PSLoop
PSLt
PSMod
PSMoveto
PSMul
PSNe
PSNewpath
PSPop
PSPstack
PSRlineto
PSRmoveto
PSShow
PSShowpage
PSString
PSStroke
PSSub