XView binary compatibility (taking any OpenWindows V2 application dynamically linked against OpenWindows V2 XView, pointing the application towards V3 XView libraries and expecting the application to run) is supported with two possible exceptions:
XView 2.0 contained an interim API to shield clients from changes in the underlying Drag-and-Drop protocol. Applications that used this interface to "receive drops" will be fine when run against OpenWindows V3 libraries. However, if an application attempted to handle the protocol exchange itself, it will need source level changes.
XView applications that use the XVPS are not supported in Solaris 2.x.