Add docs about pager in the pipeline command

static/docs/command-reference/pipeline/show.md

@@ -35,8 +35,7 @@ instead of stages.
   option is specified) of stage outputs instead of paths to DVC-files.
 
 - `--ascii` - visualize pipeline. It will print a graph (ASCII) instead of a
-  list of path to DVC-files. (To navigate, use arrows or `W`, `A`, `S`, `D`
-  keys. To exit, press `Q`.)
+  list of path to DVC-files. (To navigate, use arrows keys. To exit, press `Q`.)
 
 - `--dot` - show contents of `.dot` files with a DVC pipeline graph. It can be
   passed to third party visualization utilities.
@@ -52,6 +51,29 @@ instead of stages.
 
 - `-v`, `--verbose` - displays detailed tracing information.
 
+## Paging the output
+
+This command's output is automatically pushed to `less` command line tool if
+`less` is runnable (installed and can be executed in your shell). To be exact,
+the actual command is `less --chop-long-lines --clear-screen`.
+
+If `less` is not runnable (usually Microsoft Windows), the ouput is simply
+printed out.
+
+> Note Microsoft Windows users may also want to read
+> [this how-to](/doc/user-guide/running-dvc-on-windows#enabling-paging-with-less).
+
+### Providing a custom pager
+
+You can also override the default pager via `DVC_PAGER` environemnt variable.
+
+For example
+
+```
+# one-time change in Bash
+DVC_PAGER=more dvc pipeline show --ascii my-pipeline.dvc
+```
+
 ## Examples
 
 Default mode: show stage files that `output.dvc` recursively depends on:

static/docs/user-guide/running-dvc-on-windows.md

@@ -47,3 +47,20 @@ The performance of NTFS degrades while handling large volumes of files in a
 directory.
 [Here](https://stackoverflow.com/questions/197162/ntfs-performance-and-large-volumes-of-files-and-directories)
 is the resource for reference.
+
+## Enabling paging with `less`
+
+By default DVC uses `less` to page output for some commands. Although, many
+operating systems have `less` preinstalled, there are still platforms where
+`less` is not installed. This usually happens for Microsoft Windows.
+Fortunately, there is a easy way of installing `less` via
+[Chocolatey](https://chocolatey.org/).
+
+```
+choco install less
+```
+
+If you do not want to use [Chocolatey](https://chocolatey.org/) for some reason,
+you can still provide `less` by your own way. However, you must make `less` to
+be runnable from `cmd`/`Powershell`. This usually means to add the `less`
+installation directory to the `PATH` environement vairable.