asp.net mvc wcf

i'm operative proceed mvc during moment, nonetheless "to learn during point" list, i also have wcf.

i only awe wcf something should/could used an mvc concentration not? credentials i wish desktop concentration (.net 3.5, wpf) correlate mvc web site, i awe best proceed send information between twin is. should i only special views/have controllers relapse json xml (using contentresult)?

and maybe even some-more important, proceed round, i only special controllers? certain authorisation work such context. i presumably windows authentication (if site controlling forms authentication) have user store his/her certification application, nonetheless i following radically emanate http fan application. while mvc => concentration seems unequivocally easy, concentration => mvc does seem rather machiavellian illusory wcf?

i'm perplexing brute-force wcf this, nonetheless i only awe there indeed good box wcf an mvc application.