The present invention includes a window jamb assembly mountable in a jamb of a double hung window for cooperative engagement with upper and lower sash assemblies. The system includes a testing device coupled to a remote device by a network. The control device, which comprises a device for offsetting the angular position of the cam position relative to the crankshaft, allows to control the opening and closing duration of the valve over a very wide range extending, for opening, from 210\xb0 to 350\xb0 of crankshaft rotation approximately, by varying the valve opening and closing times independently of each other. In response to determining that the application program is configured for use with a display device having a lower pixel density, the parameters are scaled for the higher pixel density display device and the application programming interface is called using the scaled parameters. Additionally, the present invention relates to imaging methods employing the present compounds of Formulas I\u2013IV. Some of these polyester block copolymers could not be formed into a balloon using prior art blow molding processes.