As 64-bit X workstations and servers become more commonplace, more X applications and libraries will be ported to or developed for 64-bit operating environments. While Digital and SGI are at the forefront of this trend, you can expect other workstation vendors to follow their lead. If you are well informed about the portability issues involved in moving to 64-bit systems, you and your X code will be ready for 64-bit systems and the process of migrating to 64-bit systems will be much easier.