Note that you generally do not need to change this value as the Terminal Type sets it for you.
Sets the "standard" number of screen rows.
For TN3270 applications, 24 is recommended for standard rows.
For 5250 and many TNVT connections, this should be 25, to accommodate an additional status line. For Windows/2000 and Windows/XP TelNet servers, 25 is needed to avoid unnecessary scrolling.