Princeton NJ 08540-6668 siemens!ellis (uucp) ellis.cohen@a.gp.cs.cmu.edu (arpa) (609) 734-6521 The Siemens R T L Tiled Window Manager automatically adjusts the size and positionThe manager has recently been ported to X version of tiled un'ndows to balance competing 11 [Sche87], where it acts as a window manager for X (rather than Andrew) clients using the redirection demands for screen space. The degree of automation can be set by the m e r and facilities of the X server. An object code version for the controls strategies which range f r o m strictlySun and Microvax, supporting many of the strategies local to those which can affect all the described in this paper, is being made publicly available windows on the screen. T h i s paper discusses these strategies, indicates the tradeo ffs as release 4.1.involved, and briefly describes the algorithms used in their implementation.