diff --git a/desk.acc/show.text.file/a2d.inc b/desk.acc/show.text.file/a2d.inc
index 9091a62..0bd6f27 100644
--- a/desk.acc/show.text.file/a2d.inc
+++ b/desk.acc/show.text.file/a2d.inc
@@ -8,7 +8,8 @@ UNKNOWN_CALL    := $8E00
 
 A2D_TEXT        := $19          ; { .addr data, .byte len }
 A2D_GET_BUTTON  := $2A          ; { .byte state (0=up, 1=down?, 2=released?) }
-A2D_GET_MOUSE   := $40          ; { .word x, .word y, ????}
+A2D_GET_MOUSE   := $40          ; { .word x, .word y, ????...}
+A2D_CLOSE_BTN   := $43          ; { .byte closed, .byte ??, byte ?? } - enter loop
 
 ;;; Macros
 .macro  A2D_CALL    op, addr
diff --git a/desk.acc/show.text.file/stf.list b/desk.acc/show.text.file/stf.list
index cbdccb8..abf702b 100644
--- a/desk.acc/show.text.file/stf.list
+++ b/desk.acc/show.text.file/stf.list
@@ -78,7 +78,8 @@ Current file: stf.s
 000800  2               
 000800  2               A2D_TEXT        := $19          ; { .addr data, .byte len }
 000800  2               A2D_GET_BUTTON  := $2A          ; { .byte state (0=up, 1=down?, 2=released?) }
-000800  2               A2D_GET_MOUSE   := $40          ; { .word x, .word y, ????}
+000800  2               A2D_GET_MOUSE   := $40          ; { .word x, .word y, ????...}
+000800  2               A2D_CLOSE_BTN   := $43          ; { .byte closed, .byte ??, byte ?? } - enter loop
 000800  2               
 000800  2               ;;; Macros
 000800  2               .macro  A2D_CALL    op, addr
@@ -341,7 +342,10 @@ Current file: stf.s
 000978  1  00           L0978:  .byte   $00
 000979  1  00           L0979:  .byte   $00
 00097A  1  00 00 00     L097A:  .byte   $00,$00,$00
-00097D  1  00 00 00     L097D:  .byte   $00,$00,$00
+00097D  1               
+00097D  1               close_btn_state:
+00097D  1  00 00 00             .byte   $00,$00,$00
+000980  1               
 000980  1  00           L0980:  .byte   $00
 000981  1  00           L0981:  .byte   $00
 000982  1  00 00        L0982:  .byte   $00,$00
@@ -524,7 +528,7 @@ Current file: stf.s
 000AE9  1  D0 E6                bne     input_loop
 000AEB  1  AD 75 09             lda     L0975
 000AEE  1  C9 05                cmp     #$05
-000AF0  1  F0 2F                beq     L0B21
+000AF0  1  F0 2F                beq     close_btn
 000AF2  1  AE 71 09             ldx     mouse_x
 000AF5  1  8E 78 09             stx     L0978
 000AF8  1  8E 80 09             stx     L0980
@@ -544,17 +548,21 @@ Current file: stf.s
 000B1B  1  20 3A 11     L0B1B:  jsr     on_title_bar_click
 000B1E  1  4C D1 0A             jmp     input_loop
 000B21  1               
-000B21  1  20 00 40 43  L0B21:  A2D_CALL $43, L097D
+000B21  1               ;;; Close box clicked?
+000B21  1               .proc close_btn
+000B21  1  20 00 40 43          A2D_CALL A2D_CLOSE_BTN, close_btn_state     ; wait to see if the click completes
 000B25  1  7D 09        
-000B27  1  AD 7D 09             lda     L097D
-000B2A  1  F0 A5                beq     input_loop
+000B27  1  AD 7D 09             lda     close_btn_state ; all the way?
+000B2A  1  F0 A5                beq     input_loop      ; nope
 000B2C  1  20 AF 08             jsr     close_file
 000B2F  1  20 00 40 39          A2D_CALL $39, L0994
 000B33  1  94 09        
-000B35  1  20 00 8E             jsr     UNKNOWN_CALL
+000B35  1                       ;; window is gone by this point - is previous a redraw/destroy?
+000B35  1  20 00 8E             jsr     UNKNOWN_CALL    ; hides the cursor?
 000B38  1  0C                   .byte   $0C
 000B39  1  00 00                .addr   NULL
-000B3B  1  60                   rts
+000B3B  1  60                   rts                     ; exits input loop
+000B3C  1               .endproc
 000B3C  1               
 000B3C  1  20 00 40 45          A2D_CALL $45, L0977
 000B40  1  77 09        
diff --git a/desk.acc/show.text.file/stf.o b/desk.acc/show.text.file/stf.o
index e44c603..5a07b7c 100644
Binary files a/desk.acc/show.text.file/stf.o and b/desk.acc/show.text.file/stf.o differ
diff --git a/desk.acc/show.text.file/stf.s b/desk.acc/show.text.file/stf.s
index fa470fb..10bfc15 100644
--- a/desk.acc/show.text.file/stf.s
+++ b/desk.acc/show.text.file/stf.s
@@ -237,7 +237,10 @@ L0977:  .byte   $64
 L0978:  .byte   $00
 L0979:  .byte   $00
 L097A:  .byte   $00,$00,$00
-L097D:  .byte   $00,$00,$00
+
+close_btn_state:
+        .byte   $00,$00,$00
+
 L0980:  .byte   $00
 L0981:  .byte   $00
 L0982:  .byte   $00,$00
@@ -408,7 +411,7 @@ input_loop:
         bne     input_loop
         lda     L0975
         cmp     #$05
-        beq     L0B21
+        beq     close_btn
         ldx     mouse_x
         stx     L0978
         stx     L0980
@@ -429,15 +432,18 @@ L0B1B:  jsr     on_title_bar_click
         jmp     input_loop
 
 ;;; Close box clicked?
-L0B21:  A2D_CALL $43, L097D
-        lda     L097D
-        beq     input_loop
+.proc close_btn
+        A2D_CALL A2D_CLOSE_BTN, close_btn_state     ; wait to see if the click completes
+        lda     close_btn_state ; all the way?
+        beq     input_loop      ; nope
         jsr     close_file
         A2D_CALL $39, L0994
-        jsr     UNKNOWN_CALL
+        ;; window is gone by this point - is previous a redraw/destroy?
+        jsr     UNKNOWN_CALL    ; hides the cursor?
         .byte   $0C
         .addr   NULL
-        rts
+        rts                     ; exits input loop
+.endproc
 
         A2D_CALL $45, L0977
         jsr     L10FD