Split-Screen Editor 
This function provides a detailed display of all changes to the source text of a repository object. If necessary, you can adjust the changes to your own modifications here.
Features
The split-screen editor has two areas:
On the left-hand side, the source text is displayed as it appears after copying changes. The changes are indicated by symbols to the left of the source text rows:
Context rows, i.e. unchanged rows that system used to find the position at which to make changes.
Inserted rows
Deleted rows
Unchanged rows
On the left-hand side, you can:
Edit manually.
Select, delete, copy and insert blocks.
To select a block and highlight it, position the cursor on the header row and choose Select.
You can also select rows. Position the cursor on the first row of the block you want to select, and choose Select. Then position the cursor on the last row and choose Select again.
You can reset all changes that you have made in the splitscreen editor, one-by-one, with Reset Changes (Undo).
Yyou can restore changes that have been reset, with Restore Previous Status (Redo).
You can navigate forward to the next change, or back to the last one, with the arrow keys.
You can merge two rows with Concatenate.
The Undo/Redo pushbutton appears between the left and right-hand side of the editor, whenever a block is inserted or deleted. You can use these functions to reset or restore individual changes. When you do this, individual delete and insert blocks are swapped over.
On the right-hand side, deleted program components and corrections that the system cannot automatically take over are displayed. These are flagged by symbols as context, delete and inset blocks.