To explore the potential effect of computer type on the Test of English as a Foreign Language-Internet-Based Test (TOEFL iBT) Writing Test, a sample of 444 international students was used. The students were randomly assigned to either a laptop or a desktop computer to write two TOEFL iBT practice essays in a simulated testing environment, followed by a survey of computer experience. The survey results suggested that the participants had extensive experience using computers, had more experience with laptops than with desktops, and preferred using the laptop computers to the desktop computers. The computer type (laptop or desktop computer) was found to have a negligible effect on essay performance (essay score, essay length, and writing speed). However, other factors, including gender, regional background, daily experience with laptop or desktop computers, preference for a particular pointing device, and previous TOEFL experience, were found to be significantly related to essay performance but did not interact with computer type. (Contains 4 tables and 1 note.)