5.2.14 Deleting the character under the cursor

Procedure: delch win #:key y x

This routine deletes the character under the cursor; all characters to the right of the cursor on the same line are moved to the left one position and the last character on the line is filled with a blank. The cursor position does not change (after moving to y, x, if specified). (This does not imply use of the hardware delete character feature.)

It returns #f on failure and #t on success.