Detect if program is running with full administrator rights

Question

I need to determine if my program is running with full administrator rights. By that I mean if uac is turned on (for win vista/7) that I need to determine if the program act

Answer 1

• Win9x: Everyone is "admin"
• NT4: OpenThreadToken/OpenProcessToken + GetTokenInformation(...,TokenGroups,...) on DOMAIN_ALIAS_RID_ADMINS SID in a loop
• 2000+: OpenThreadToken/OpenProcessToken + CheckTokenMembership on DOMAIN_ALIAS_RID_ADMINS SID

Other alternatives are: IsUserAnAdmin or AccessCheck

Checking the TOKEN_ELEVATION* stuff in the token is not required for testing the current process but it is useful if you need to find out if the user could elevate because they have a split token etc.