AX - How get info about AX user

When you need info about connected user, you can use class UserInfo and xUserInfo:

UserInfo userInfo = xUserInfo::find( false, curUserId() );
    
if ( userInfo ) {
  info( "Name: " + userInfo.name );        
  info( "Language: " + userInfo.language );
  info( "Enabled: " + ( userInfo.enable ? "Yes" : "No" ) );
}

Output:

Name: Aldiss, Brian
Language: en-us
Enabled: Yes

Note: For current user you can use directly:

UserInfo userInfo = xUserInfo::find();

AX - How get list of active AX users

select a.id, a.name, substring( a.networkdomain, 1, 25 ) as networkdomain,
substring( a.networkalias, 1, 25 ) as networkalias
from [dbinst].[dbo].userinfo a
where
a.enable = 1
order by a.id