The Splitscreen Editor 
The Splitscreen Editor
The splitscreen editor allows you to display the source code of two programs side by side. The two programs do not necessarily have to be in the same system. The editor contains a restricted set of normal ABAP Editor functions, complemented by additional special splitscreen functions.
Contents
Overview Starting the Splitscreen Editor The Initial Screen Special Splitscreen Editor Functions Editor Functions
If you intend to use the splitscreen editor in conjunction with the Modification Assistant, refer to the
Aligning Program Sections documentation.