At issue is whether hundreds of thousands of women who work or have worked in Wal-Mart retail stores…can collectively seek an injunction and lost pay against the nation's largest retailer for discriminatory wages and career advancement...Plaintiffs' brief argues [that] Personnel decisions are exercised within a corporate culture that is rife with gender stereotypes demeaning to female employees: Wal-Mart executives refer to women employees as "Janie Qs," approve holding business meetings at Hooters restaurants, and attribute the absence of women in top positions to men being more aggressive in seeking advancement…