Alternating Hemiplegia 
AHC information sheet compiled by the National Institute of Neurological Disorders and Stroke (NINDS).
http://www.ninds.nih.gov/health_and_medical/disorders/alternatinghemiplegia.htmFamily Village 
Links to information about Alternating Hemiplegia of Childhood. Includes data about a discussion group.
http://www.familyvillage.wisc.edu/lib_alth.htm
NORD: Alternating Hemiplegia of Childhood 
Offers alternative names, a general discussion and further resources.
http://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Alternating%20Hemiplegia%20of%20Childhood