'''The following commands can be used in the ESC menu'''
* B: Set the <nowiki><B></nowiki>egin column of a marked block to the current cursor position.
* E: Set the <E>nd column of a marked block to the current cursor position.
* CLR: Clears both block marks (Begin and End marks). New marks can be set now. Marked blocks need a Begin and End mark to be shown. In MODE 2 blocks are shown inverted. And in MODE 1 blocks are shown in mixed-color