President Obama's Latest Executive Order .

How could he sign another executive order while the both the House and Senate were in session?  The order was signed on July 15 and according to the schedule, both congresses were in session.

Section 1. Policy. Addressing the domestic HIV epidemic is a priority of my Administration. In 2010, the White House released the first comprehensive National HIV/AIDS Strategy (Strategy), setting quantitative goals for reducing new HIV infections, improving health outcomes for people living with HIV, and reducing HIV-related health disparities.  . .

 . . . Since the release of the Strategy, additional scientific discoveries have greatly enhanced our understanding of how to prevent and treat HIV. Accordingly, further Federal action is appropriate in response to these new developments. For example, a breakthrough research trial supported by the National Institutes of Health showed that initiating HIV treatment when the immune system was relatively healthy reduced HIV transmission by 96 percent. In addition, evidence suggests that early treatment may reduce HIV-related complications. These findings highlight the importance of prompt HIV diagnosis, and because of recent advances in HIV testing technology, HIV can be detected sooner and more rapidly than ever before.

Based on these and other data, recommendations for HIV testing and treatment have changed. The U.S. Preventive Services Task Force now recommends that clinicians screen all individuals ages 15 to 65 years for HIV, and the Department of Health and Human Services Guidelines for Use of Antiretroviral Agents now recommends offering treatment to all adolescents and adults diagnosed with HIV. . . 

Sec. 3. Establishment of the HIV Care Continuum Working Group. There is established the HIV Care Continuum Working Group (Working Group) to support the Initiative. The Working Group shall coordinate Federal efforts to improve outcomes nationally across the HIV care continuum.  

(a) Membership. The Working Group shall be co-chaired by the Director of the Office of National AIDS Policy and the Secretary of Health and Human Services or designee (Co-Chairs). In addition to the Co-Chairs, the Working Group shall consist of representatives from:

(i) the Department of Justice;

(ii) the Department of Labor;

(iii) the Department of Health and Human Services;

(iv) the Department of Housing and Urban Development;

(v) the Department of Veterans Affairs;

(vi) the Office of Management and Budget; and

(vii) other agencies and offices, as designated by the Co-Chairs.

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There's lots more here:

http://www.whitehouse.gov/the-press-office/2013/07/15/executive-order-hiv-care-continuum-initiative