diff --git a/.task/backlog.data b/.task/backlog.data
new file mode 100644
index 0000000..855c50a
--- /dev/null
+++ b/.task/backlog.data
@@ -0,0 +1,3 @@
+{"description":"USR signal: clear output when receiving a SIGUSR1","entry":"20240216T191316Z","modified":"20240216T191316Z","status":"pending","uuid":"1197a96b-a541-451d-ada4-52e30b423907"}
+{"description":"vertical output: allow to display as a regular list of notifications","entry":"20240216T191358Z","modified":"20240216T191358Z","status":"pending","uuid":"3843de37-6864-4768-b815-ee35bb39d1b9"}
+{"description":"rich frames: use rich to produce framed output in vertical display","entry":"20240216T191433Z","modified":"20240216T191433Z","status":"pending","uuid":"3c0b6104-eb47-401e-815d-7105f876fd12"}
diff --git a/.task/completed.data b/.task/completed.data
new file mode 100644
index 0000000..e69de29
diff --git a/.task/pending.data b/.task/pending.data
new file mode 100644
index 0000000..76e0edb
--- /dev/null
+++ b/.task/pending.data
@@ -0,0 +1,3 @@
+[description:"USR signal: clear output when receiving a SIGUSR1" entry:"1708110796" modified:"1708110796" status:"pending" uuid:"1197a96b-a541-451d-ada4-52e30b423907"]
+[description:"vertical output: allow to display as a regular list of notifications" entry:"1708110838" modified:"1708110838" status:"pending" uuid:"3843de37-6864-4768-b815-ee35bb39d1b9"]
+[description:"rich frames: use rich to produce framed output in vertical display" entry:"1708110873" modified:"1708110873" status:"pending" uuid:"3c0b6104-eb47-401e-815d-7105f876fd12"]
diff --git a/.task/undo.data b/.task/undo.data
new file mode 100644
index 0000000..4fcb5d2
--- /dev/null
+++ b/.task/undo.data
@@ -0,0 +1,9 @@
+time 1708110796
+new [description:"USR signal: clear output when receiving a SIGUSR1" entry:"1708110796" modified:"1708110796" status:"pending" uuid:"1197a96b-a541-451d-ada4-52e30b423907"]
+---
+time 1708110838
+new [description:"vertical output: allow to display as a regular list of notifications" entry:"1708110838" modified:"1708110838" status:"pending" uuid:"3843de37-6864-4768-b815-ee35bb39d1b9"]
+---
+time 1708110873
+new [description:"rich frames: use rich to produce framed output in vertical display" entry:"1708110873" modified:"1708110873" status:"pending" uuid:"3c0b6104-eb47-401e-815d-7105f876fd12"]
+---
diff --git a/doc/screenshot_0.png b/doc/screenshot_0.png
new file mode 100644
index 0000000..30985e1
Binary files /dev/null and b/doc/screenshot_0.png differ