SAP license woes

Hi-

I can't seem to get this NW4 Demo license to last longer than a couple weeks. Although it says it will expire 2-16-2006, it keeps locking up the "developer" account (and giving some license check error), whereas the sap* account always works. Anyway, my sap license administration has two installed license. One is a temp license with a "red" State code, the other a license with a valid looking hardware key with a "green" State code. I can't seem to figure out how to make the developer login last longer than two weeks. Does anyone know how to make a developer login last longer than two weeks!?

Also, what is the developer access key? How do I get one?

Thanks-

Kevin