diff --git a/README.md b/README.md
index abbc51a..e36e4de 100644
--- a/README.md
+++ b/README.md
@@ -178,9 +178,10 @@ There can be some options before your `[cmd]`:
 | `-auto=?` | `unset` | event name to trigger `QuickFixCmdPre`/`QuickFixCmdPost` [name] autocmd. |
 | `-raw` | `unset` | use raw output if provided, and `&errorformat` will be ignored. |
 | `-strip` | `unset` | remove the heading/trailing messages if provided (omit command and "[Finished in ...]" message). |
-| `-pos=?` | "bottom" | When using internal terminal with `-mode=term`, `-pos` is used to specify where to split the terminal window, it can be one of `"tab"`, `"curwin"`, `"top"`, `"bottom"`, `"left"`, `"right"` and `"external"`. And you can [customize new runners](#customize-runner) and pass runner's name to `-pos` option. |
+| `-pos=?` | "bottom" | When using internal terminal with `-mode=term`, `-pos` is used to specify where to split the terminal window, it can be one of `"tab"`, `"curwin"`, `"top"`, `"bottom"`, `"left"`, `"right"`, `"topedge"`, `"bottomedge"`, `"leftedge"`, `"rightedge"` and `"external"`. And you can [customize new runners](#customize-runner) and pass runner's name to `-pos` option. |
 | `-rows=num` | 0 | When using a horizontal split terminal, this value represents the height of terminal window. |
 | `-cols=num` | 0 | When using a vertical split terminal, this value represents the width of terminal window. |
+| `-unique=?` | 0 | When using the internal terminal with `-mode=term`, `-unique=1` allows only one terminal window in the current tab page that was spawned using this flag to exist at a time (any existing terminal in the current tab page spawned with `-unique=1` will be closed).
 | `-errorformat=?` | `unset` | errorformat for error matching, if it is unprovided, use current `&errorformat` value. Beware that `%` needs to be escaped into `\%`. |
 | `-focus=?` | 1 | set to `0` to prevent focus changing when `-mode=term` |
 | `-hidden=?` | 0 | set to `1` to setup `bufhidden` to `hide` for internal terminal |
@@ -283,6 +284,10 @@ AsyncRun is capable to run commands in Vim/NeoVim's internal terminal with the `
 - `-pos=bottom`: open the terminal below the current window.
 - `-pos=left`: open the terminal on the left side.
 - `-pos=right`: open the terminal on the right side.
+- `-pos=topedge`: open the terminal above all other windows.
+- `-pos=bottomedge`: open the terminal below all other windows.
+- `-pos=leftedge`: open the terminal to the left of all other windows.
+- `-pos=rightedge`: open the terminal to the right of all other windows.
 - `-pos=hide`: don't open a window, run in background.
 - `-pos=external`: use an external terminal (Windows only).
 
@@ -292,6 +297,7 @@ Examples:
 :AsyncRun -mode=term -pos=tab python "$(VIM_FILEPATH)"
 :AsyncRun -mode=term -pos=bottom -rows=10 python "$(VIM_FILEPATH)"
 :AsyncRun -mode=term -pos=right -cols=80 python "$(VIM_FILEPATH)"
+:AsyncRun -mode=term -pos=bottomedge -rows=10 -unique=1 bash
 :AsyncRun -mode=term -pos=curwin python "$(VIM_FILEPATH)"
 :AsyncRun -mode=term -pos=curwin -hidden python "$(VIM_FILEPATH)"
 ```
diff --git a/doc/asyncrun.md b/doc/asyncrun.md
index 609abbc..24046f1 100644
--- a/doc/asyncrun.md
+++ b/doc/asyncrun.md
@@ -157,9 +157,10 @@ There can be some options before your `[cmd]`:
 - `-auto=?`: event name to trigger `QuickFixCmdPre`/`QuickFixCmdPost` [name] autocmd. 
 - `-raw`: use raw output if provided, and `&errorformat` will be ignored. 
 - `-strip`: remove the heading/trailing messages if provided (omit command and "[Finished in ...]" message). 
-- `-pos=?`: When using internal terminal with `-mode=term`, `-pos` is used to specify where to split the terminal window, it can be one of `"tab"`, `"curwin"`, `"top"`, `"bottom"`, `"left"`, `"right"` and `"external"`. And you can [customize new runners](#customize-runner) and pass runner's name to `-pos` option. 
+- `-pos=?`: When using internal terminal with `-mode=term`, `-pos` is used to specify where to split the terminal window, it can be one of `"tab"`, `"curwin"`, `"top"`, `"bottom"`, `"left"`, `"right"`, `"topedge"`, `"bottomedge"`, `"leftedge"`, `"rightedge"` and `"external"`. And you can [customize new runners](#customize-runner) and pass runner's name to `-pos` option. 
 - `-rows=num`: When using a horizontal split terminal, this value represents the height of terminal window. 
 - `-cols=num`: When using a vertical split terminal, this value represents the width of terminal window. 
+- `-unique=?`: When using the internal terminal with `-mode=term`, `-unique=1` allows only one terminal window in the current tab page that was spawned using this flag to exist at a time (any existing terminal in the current tab page spawned with `-unique=1` will be closed). 
 - `-errorformat=?`: errorformat for error matching, if it is unprovided, use current `&errorformat` value. Beware that `%` needs to be escaped into `\%`. 
 - `-focus=?`: set to `0` to prevent focus changing when `-mode=term`.
 - `-hidden=?`: set to `1` to setup `bufhidden` to `hide` for internal terminal 
@@ -260,6 +261,10 @@ AsyncRun is capable to run commands in Vim/NeoVim's internal terminal with the `
 - `-pos=bottom`: open the terminal below the current window.
 - `-pos=left`: open the terminal on the left side.
 - `-pos=right`: open the terminal on the right side.
+- `-pos=topedge`: open the terminal above all other windows.
+- `-pos=bottomedge`: open the terminal below all other windows.
+- `-pos=leftedge`: open the terminal to the left of all other widows.
+- `-pos=rightedge`: open the terminal to the right of all other windows.
 - `-pos=hide`: don't open a window, run in background.
 - `-pos=external`: use an external terminal (windows only).
 
@@ -269,6 +274,7 @@ Examples:
 :AsyncRun -mode=term -pos=tab python "$(VIM_FILEPATH)"
 :AsyncRun -mode=term -pos=bottom -rows=10 python "$(VIM_FILEPATH)"
 :AsyncRun -mode=term -pos=right -cols=80 python "$(VIM_FILEPATH)"
+:AsyncRun -mode=term -pos=bottomedge -cols=10 -unique=1 bash
 :AsyncRun -mode=term -pos=curwin python "$(VIM_FILEPATH)"
 :AsyncRun -mode=term -pos=curwin -hidden python "$(VIM_FILEPATH)"
 ```
diff --git a/doc/asyncrun.txt b/doc/asyncrun.txt
index 72aef4f..70289b1 100644
--- a/doc/asyncrun.txt
+++ b/doc/asyncrun.txt
@@ -269,10 +269,11 @@ There can be some options before your '[cmd]':
 - '-strip': remove the heading/trailing messages if provided (omit command
   and "[Finished in ...]" message).
 
-- '-pos=?': When using internal terminal with '-mode=term', '-pos' is used to
-  specify where to split the terminal window, it can be one of '"tab"',
-  '"curwin"', '"top"', '"bottom"', '"left"', '"right"' and '"external"'. And
-  you can customize new runners and pass runner's name to '-pos' option.
+- '-pos=?': When using the internal terminal with '-mode=term', '-pos' is used
+  to specify where to split the terminal window, it can be one of '"tab"',
+  '"curwin"', '"top"', '"bottom"', '"left"', '"right"', '"topedge"',
+  '"bottomedge"', '"leftedge"', '"rightedge"' and '"external"'. And you can
+  customize new runners and pass runner's name to '-pos' option.
 
 - '-rows=num': When using a horizontal split terminal, this value represents
   the height of terminal window.
@@ -280,6 +281,11 @@ There can be some options before your '[cmd]':
 - '-cols=num': When using a vertical split terminal, this value represents
   the width of terminal window.
 
+- '-unique=?': When using the internal terminal with '-mode=term', '-unique=1'
+  allows only one terminal window in the current tab page that was spawned
+  using this flag to exist at a time (any existing terminal in the current tab
+  page spawned with '-unique=1' will be closed).
+
 - '-errorformat=?': errorformat for error matching, if it is unprovided, use
   current '&errorformat' value. Beware that '%' needs to be escaped into
   '\%'.
@@ -422,6 +428,10 @@ AsyncRun is capable to run commands in Vim/NeoVim's internal terminal with the
 - '-pos=bottom': open the terminal below the current window.
 - '-pos=left': open the terminal on the left side.
 - '-pos=right': open the terminal on the right side.
+- '-pos=topedge': open the terminal above all other windows.
+- '-pos=bottomedge': open the terminal below all other windows.
+- '-pos=leftedge': open the terminal to the left of all other widows.
+- '-pos=rightedge': open the terminal to the right of all other windows.
 - '-pos=hide': don't open a window, run in background.
 - '-pos=external': use an external terminal (windows only).
 
@@ -430,6 +440,7 @@ Examples:
   :AsyncRun -mode=term -pos=tab python "$(VIM_FILEPATH)"
   :AsyncRun -mode=term -pos=bottom -rows=10 python "$(VIM_FILEPATH)"
   :AsyncRun -mode=term -pos=right -cols=80 python "$(VIM_FILEPATH)"
+  :AsyncRun -mode=term -pos=bottomedge -cols=10 -unique=1 bash
   :AsyncRun -mode=term -pos=curwin python "$(VIM_FILEPATH)"
   :AsyncRun -mode=term -pos=curwin -hidden python "$(VIM_FILEPATH)"
 <
diff --git a/plugin/asyncrun.vim b/plugin/asyncrun.vim
index c6c69d6..1b09472 100644
--- a/plugin/asyncrun.vim
+++ b/plugin/asyncrun.vim
@@ -103,6 +103,10 @@
 "     :AsyncRun -mode=term -pos=bottom -rows=15 bash
 "     :AsyncRun -mode=term -pos=left -cols=40 bash
 "     :AsyncRun -mode=term -pos=right -cols=40 bash
+"     :AsyncRun -mode=term -pos=topedge -rows=15 -unique=1 bash
+"     :AsyncRun -mode=term -pos=bottomedge -rows=15 -unique=1 bash
+"     :AsyncRun -mode=term -pos=leftedge -cols=40 -unique=1 bash
+"     :AsyncRun -mode=term -pos=rightedge -cols=40 -unique=1 bash
 "
 " Additional:
 "     AsyncRun uses quickfix window to show job outputs, in order to
@@ -1208,6 +1212,9 @@ function! s:terminal_open(opts)
 	let opts.jid = jid
 	let opts.bid = bid
 	let s:async_term[pid] = opts
+	if get(a:opts, 'unique', 0)
+		execute "let s:termid." . tabpagenr() . " = " . win_getid()
+	endif
 	return pid
 endfunc
 
@@ -1328,7 +1335,36 @@ function! s:start_in_terminal(opts)
 	if avail < 0 || get(a:opts, 'reuse', 1) == 0
 		let rows = get(a:opts, 'rows', '')
 		let cols = get(a:opts, 'cols', '')
-		if pos == 'top'
+		if get(a:opts, 'unique', 0)
+			if !exists("s:termid")
+				let s:termid = {}
+			endif
+			let s:info = {}
+			augroup UniqueTermLeave
+				autocmd!
+				autocmd TabLeave * let s:info.last_winnr = winnr('$') |
+							\ let s:info.last_tab = tabpagenr('$')
+				autocmd BufWinLeave * if get(s:info, 'last_winnr', -1) == 1 |
+							\ execute "unlet s:termid.".s:info.last_tab |
+							\ endif
+				autocmd BufWinLeave * if (winnr() ==
+							\ win_id2win(get(s:termid, tabpagenr()))) |
+							\ execute "unlet s:termid.".tabpagenr() |
+							\ endif
+			augroup END
+			if has_key(s:termid, tabpagenr())
+				execute win_id2win(get(s:termid, tabpagenr()))."quit!"
+			endif
+		endif
+		if pos == "topedge" || pos == "te"
+			exec "topleft " . rows . "split"
+		elseif pos == "bottomedge" || pos == "be"
+			exec "botright " . rows . "split"
+		elseif pos == "leftedge" || pos == "le"
+			exec "topleft " . cols . "vs"
+		elseif pos == "rightedge" || pos == "re"
+			exec "botright " . cols . "vs"
+		elseif pos == 'top'
 			exec "leftabove " . rows . "split"	
 		elseif pos == 'bottom' || pos == 'bot'
 			exec "rightbelow " . rows . "split"