MS-DOS Internal Commands
The CTTY Command
Description:
Changes the terminal device used to control your system.
Command Syntax:
CTTY device
Explanation of Sytax:
device is the terminal device you want to use, such as COM1. Valid values are prn, lpt1 to lpt4, con (console), aux (auxiliary) and com1 to com4.
Command Use:
This command can be used at the MS-DOS prompt and in batch files.