MEX

MEX is a GL accelerated, stacking window system for GL2, one of two predecessors of the 4D1 operating system. MEX is a simplistic graphics windowing system with everything launched from a terminal window, similar to other early window managers. As it did not use X11 or Postscript-based 4Sight it was exceptionally quick, if impractical to build applications for.

MEX was included with all versions of GL2 but was never used by 4D1 or later SGI systems and neither was backwards compatibility considered.