The GLIMMIX procedure is an add-on to SAS/STAT for the (32-bit) Windows platform in SAS 9.1 and for the Linux and UNIX platforms in SAS 9.1.3. You can obtain the GLIMMIX procedure for SAS 9.1 as a download from http://support.sas.com. This site also contains the documentation for the GLIMMIX procedure. PROC GLIMMIX ships with SAS 9.2.