A non-transitory computer-readable medium having a computer program readable by a computer of a portable device comprising a memory storing a plurality of external programs activated by the computer program and being connectable to an image forming device that executes a formation operation, the computer program causes the portable device to perform: obtaining type information indicating each type of the plurality of external programs; determining whether the corresponding external program is a first type or a second type; pre-processing of activating the external program determined as the first type and obtaining a parameter indicating a condition of generating the image data designated by a user; instructing the image forming device to execute the formation operation; and post-processing of activating the external program determined as the second type with designating the image data formed in the formation operation.