[NTG-context] Pstricks and Asymptote

I apologize if this has been asked before, but would appreciate if anyone could answer this again. (a) Is there an easy way to incorporate asymptote code in a Context document, like there exists in Latex. In latex you can include it between \begin{asy} \end{asy} (b) Is there an easy way to incorporate pstricks code in a Context document. If there is, does that way work both with MKII and MKIV or only with one of them. The reason I am asking is that eventually all the new Context features will be in MKIV. I want to know what graphics packages I can use with it other than Metapost. Thanks.