A computer readable device storing print control instructions to be executed by a computer communicatively connected to at least one printer via a network is provided. The print control instructions comprise at least a monitoring program. The monitoring program, when executed by the computer, causes the computer to function as: a monitoring module configured to monitor setting information in which location information of the printer on the network is written to detect writing of the location information, and a port setting module configured to, upon detection of the writing of the location information, set a logical print port having the written location information set therein as a print port to be used.