Th Wndws P, nfrmlly WnP, s th fndtnl pplctn prgrmmng ntrfc (P) tht llws cmptr prgrm t ccss th ftrs f th Mcrsft Wndws prtng systm n whch th prgrm s rnnng.
ch mjr vrsn f th Wndws P hs dstnct nm tht dntfs cmptblty spct f tht vrsn. Fr xmpl, Wn32 s th mjr vrsn f Wndws P tht rns n 32-bt systms. Th nm, Wndws P, cllctvly rfrs t ll vrsns f ths cpblty f Wndws.
Mcrsft prvds dvlpr spprt v sftwr dvlpmnt kt, Mcrsft Wndws SDK, whch nclds dcmnttn nd tls fr bldng sftwr bsd n th Wndws P.