The cross-domain link between NCP2 and NCP3 is made available through the activation of LINK3 and LINKSTA3 by HOST1. Because this link is a cross-domain link, by definition, NCP3 is not activated by HOST1, and LINK3 and LINKSTA3 cannot be automatically activated. Therefore, a cross-domain link and link station must be directly or indirectly activated. When NCP2 is deactivated and CDLINK=INACT is specified in the VARY INACT command, VTAM® indirectly deactivates all cross-domain links and link stations (because they are below the NCP in the resource hierarchy). LINK2 and LINKSTA4 must have become active in NCP3 either through the SDLC monitor mode function or through activation by HOST2.