Even as the Senate wraps up work on a new immigration bill that some say doesn't go far enough in easing rules for foreign high-tech workers, China is changing its regulations to make it easier for U.S. firms to ship employees there and a law firm with ties to Washington is helping to spread the word.

China has just changed its tax laws, relieving confusion about how workers of foreign firms sent to their China plants and outlets are taxed.

Baker & McKenzie, a leading U.S. law firm that focuses on China, is hosting a seminar in Shanghai to describe the rules change to international clients who want to send more workers to China.

"All You Need to Know about Moving Expat Employees to China -- Immigration, Employment and Tax Issues," is the title of seminar by the firm whose Washington office advises companies on U.S. laws and regulations.

"When setting up their businesses in China, [multinational corporations] regularly need to send management staff and specialists from headquarters to work in their Chinese subsidiaries either through secondment or other types of arrangements. The move triggers immigration, employment and tax issues that intersect. Planning ahead will ensure a smooth transition of the employees, high morale, and no interruption to business operations," said the firm, promoting its June 6 seminar.