Hi, Here is a frame-wide transparency code for Cocoa port. The syntax is the same as X port and w32 port. As far as I tested, this one seamlessly coexists with NS port's face-transparency (e.g. ns-set-background-alpha) on OSX 10.5. Could anyone test the compatibility with GNUstep? (It should do nothing on GNUstep.) best wishes, Seiji