The UW SIG Wiki server (sig.washington.edu) has been decommissioned. Below you will find links to wikis formally hosted on the SIG Wiki.
Hyak User Documentation : https://wiki.cac.washington.edu/display/hyakusers/WIKI+for+Hyak+users
Additional Communities of Practice are on the TechConnect site - http://depts.washington.edu/learnit/techconnect/communities-of-practice/