diff --git a/README.md b/README.md
index 0e7338f..bef85ad 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,6 @@ Vietnamese Telex is also available as a compatibility mode.
 | `Ctrl+V` | Vietnamese Telex |
 | `Ctrl+E` | Emoji and symbol search |
 | `Ctrl+H` | One-shot Hanja search |
-| `Ctrl+P` | Toggle popup preedit |
 
 Use `Up`/`Down` to move through candidates, `Enter` or `1`-`9` to select,
 `Tab` to cycle temporary search results, and `Esc` to cancel. `0` commits the
diff --git a/dat.h b/dat.h
index e08250a..63262b1 100644
--- a/dat.h
+++ b/dat.h
@@ -138,6 +138,10 @@ struct Drawcmd
 typedef struct Keyreq Keyreq;
 typedef struct Keyres Keyres;
 enum
+{
+	Cclientpreedit	= 1<<0,
+};
+enum
 {
 	Keypress,
 	Keyreset,
@@ -154,6 +158,7 @@ struct Keyres
 struct Keyreq
 {
 	void	*owner;	/* stable until the context's release is acknowledged */
+	int	cap;
 	int	op;
 	u32int	ks;
 	u32int	mod;
diff --git a/ibus.c b/ibus.c
index 31320a0..fff3588 100644
--- a/ibus.c
+++ b/ibus.c
@@ -303,6 +303,7 @@ sendrequest(Ictx *ctx, int op, u32int ks, u32int mod, Keyres *res)
 
 	memset(&kr, 0, sizeof kr);
 	kr.owner = ctx;
+	kr.cap = Cclientpreedit;
 	kr.op = op;
 	kr.ks = ks;
 	kr.mod = mod;
diff --git a/srv.c b/srv.c
index 45eedf0..4178069 100644
--- a/srv.c
+++ b/srv.c
@@ -41,6 +41,7 @@ clientthread(void *arg)
 	reply = chancreate(sizeof(Keyres), 0);
 	kr.reply = reply;
 	kr.owner = &fd;
+	kr.cap = Cclientpreedit;
 	while((want = srvreadkey(fd, &kr)) >= 0){
 		chansend(keyc, &kr);
 		chanrecv(reply, &res);
diff --git a/strans.c b/strans.c
index d1c8b98..41e2039 100644
--- a/strans.c
+++ b/strans.c
@@ -2,9 +2,9 @@
 #include "fn.h"
 
 static Im im;
-static int popup = 0;
 static int visible = 0;
 static void *activeowner;
+static int activecap;
 static Caret caret;
 static void dictqmap(Im*);
 static void dictqjp(Im*);
@@ -105,7 +105,7 @@ show(void)
 		pre = search.text;
 	else
 		impre(&pre);
-	if(popup){
+	if(!(activecap & Cclientpreedit)){
 		if(search.lang || isjp(&im) || im.l->map == nil ||
 		   !mapget(im.l->map, &pre, &dc.pre))
 			dc.pre = pre;
@@ -632,11 +632,6 @@ searchkey(u32int ks, u32int mod, Str *com)
 				startsearch(n, com);
 			return 1;
 		}
-		if(c == 0x10){
-			popup = !popup;
-			show();
-			return 1;
-		}
 		endsearch();
 		if(setlang(c))
 			return 1;
@@ -725,11 +720,6 @@ keystroke(u32int ks, u32int mod, Str *com)
 			startsearch(n, com);
 			return 1;
 		}
-		if(c == 0x10){
-			popup = !popup;
-			show();
-			return 1;
-		}
 		if(getlang(c) != nil){
 			if(isjp(&im) && haspre(&im))
 				commit(com);
@@ -778,6 +768,7 @@ init(void)
 	memset(&search, 0, sizeof search);
 	memset(&caret, 0, sizeof caret);
 	activeowner = nil;
+	activecap = 0;
 	visible = 0;
 }
 
@@ -800,6 +791,7 @@ imhandlekey(Keyreq *kr)
 		if(kr->owner == activeowner){
 			reset();
 			activeowner = nil;
+			activecap = 0;
 		}
 		break;
 	case Keyreset:
@@ -818,6 +810,7 @@ imhandlekey(Keyreq *kr)
 			if(kr->owner != activeowner){
 				reset();
 				activeowner = kr->owner;
+				activecap = kr->cap;
 				caret = kr->caret;
 			}else if(kr->caret.valid)
 				caret = kr->caret;
diff --git a/tests/engine_test.c b/tests/engine_test.c
index 3f853ba..599aecb 100644
--- a/tests/engine_test.c
+++ b/tests/engine_test.c
@@ -192,7 +192,8 @@ engine_dictionary_queue_latest_wins(struct ct *t)
 }
 
 static Keyres
-ownerrequestat(void *owner, int op, Rune key, u32int mod, Caret *caret)
+ownerrequestatcap(void *owner, int cap, int op, Rune key, u32int mod,
+	Caret *caret)
 {
 	Channel *reply;
 	Keyreq req;
@@ -201,6 +202,7 @@ ownerrequestat(void *owner, int op, Rune key, u32int mod, Caret *caret)
 	reply = chancreate(sizeof(Keyres), 1);
 	memset(&req, 0, sizeof req);
 	req.owner = owner;
+	req.cap = cap;
 	req.op = op;
 	req.ks = key;
 	req.mod = mod;
@@ -213,12 +215,24 @@ ownerrequestat(void *owner, int op, Rune key, u32int mod, Caret *caret)
 	return res;
 }
 
+static Keyres
+ownerrequestat(void *owner, int op, Rune key, u32int mod, Caret *caret)
+{
+	return ownerrequestatcap(owner, 0, op, key, mod, caret);
+}
+
 static Keyres
 ownerrequest(void *owner, int op, Rune key, u32int mod)
 {
 	return ownerrequestat(owner, op, key, mod, nil);
 }
 
+static Keyres
+ownerrequestcap(void *owner, int cap, int op, Rune key, u32int mod)
+{
+	return ownerrequestatcap(owner, cap, op, key, mod, nil);
+}
+
 void
 engine_active_owner_lifecycle(struct ct *t)
 {
@@ -566,7 +580,7 @@ struct Searchfix
 	Search	search;
 	Lang	*dictlang;
 	Hmap	*dict;
-	int	popup;
+	int	activecap;
 	int	visible;
 };
 
@@ -601,7 +615,7 @@ searchsave(Searchfix *f, int lang)
 	f->search = search;
 	f->dictlang = getlang(lang);
 	f->dict = f->dictlang->dict;
-	f->popup = popup;
+	f->activecap = activecap;
 	f->visible = visible;
 	draindraw(nil);
 }
@@ -629,7 +643,7 @@ emojibegin(Searchfix *f, int showpre)
 		"c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12");
 	init();
 	im.l = getlang(LangKO);
-	popup = showpre;
+	activecap = showpre ? 0 : Cclientpreedit;
 }
 
 static void
@@ -643,10 +657,54 @@ searchend(Searchfix *f)
 	draindraw(nil);
 	im = f->im;
 	search = f->search;
-	popup = f->popup;
+	activecap = f->activecap;
 	visible = f->visible;
 }
 
+void
+engine_popup_preedit_capability(struct ct *t)
+{
+	Dictres res;
+	Drawcmd dc;
+	char client, popupowner;
+
+	init();
+	im.l = getlang(LangJP);
+	draindraw(nil);
+	ownerrequestcap(&client, Cclientpreedit, Keypress, 'k', 0);
+	ownerrequestcap(&client, Cclientpreedit, Keypress, 'a', 0);
+	memset(&res, 0, sizeof res);
+	res.lang = LangJP;
+	res.key = mkstr("か");
+	res.kouho[0] = mkstr("家");
+	res.nkouho = 1;
+	dictresult(&res);
+	if(CT_CHECK(t, draindraw(&dc) > 0)){
+		CT_EQ_INT(t, 0, dc.pre.n);
+		CT_EQ_INT(t, 1, dc.nkouho);
+		checkstr(t, "client-preedit candidate", "家", &dc.kouho[0]);
+	}
+
+	ownerrequestcap(&popupowner, 0, Keypress, 'n', 0);
+	if(CT_CHECK(t, draindraw(&dc) > 0)){
+		checkstr(t, "popup preedit", "ん", &dc.pre);
+		CT_EQ_INT(t, 0, dc.nkouho);
+	}
+	memset(&res, 0, sizeof res);
+	res.lang = LangJP;
+	res.key = mkstr("ん");
+	res.kouho[0] = mkstr("ン");
+	res.nkouho = 1;
+	dictresult(&res);
+	if(CT_CHECK(t, draindraw(&dc) > 0)){
+		checkstr(t, "async popup preedit", "ん", &dc.pre);
+		CT_EQ_INT(t, 1, dc.nkouho);
+		checkstr(t, "popup candidate", "ン", &dc.kouho[0]);
+	}
+	ownerrequest(&popupowner, Keyrelease, 0, 0);
+	draindraw(nil);
+}
+
 static void
 hanjabegin(Searchfix *f, int lang)
 {
@@ -841,10 +899,8 @@ engine_emoji_single_candidate(struct ct *t)
 	Searchfix f;
 	Str com;
 
-	emojibegin(&f, 1);
+	emojibegin(&f, 0);
 	sclear(&com);
-	CT_CHECK(t, keystroke('p', Mctrl, &com));
-	CT_EQ_INT(t, 0, popup);
 	CT_CHECK(t, keystroke('e', Mctrl, &com));
 	CT_CHECK(t, search.lang);
 	CT_EQ_INT(t, LangKO, im.l->lang);
@@ -1083,7 +1139,6 @@ engine_emoji_preedit_languages(struct ct *t)
 {
 	Searchfix f;
 	Str com, shown;
-	int p;
 
 	emojibegin(&f, 0);
 	init();
@@ -1105,15 +1160,10 @@ engine_emoji_preedit_languages(struct ct *t)
 		CT_CHECK(t, keystroke('E', Mctrl|Mshift, &com));
 		CT_EQ_INT(t, LangJP, im.l->lang);
 		CT_CHECK(t, keystroke('a', 0, &com));
-		p = popup;
 		CT_CHECK(t, !keystroke(Kmodfirst+2, 0, &com));
 		CT_CHECK(t, search.lang);
 		checkstr(t, "modifier preserves search", "a", &search.text);
-		CT_CHECK(t, keystroke('P', Mctrl|Mshift, &com));
-		CT_EQ_INT(t, !p, popup);
-		CT_CHECK(t, search.lang);
-		CT_CHECK(t, !keystroke(Kmodfirst+2, 0, &com));
-		CT_CHECK(t, keystroke('E', Mctrl|Mshift, &com));
+		CT_CHECK(t, !keystroke('P', Mctrl|Mshift, &com));
 		CT_CHECK(t, !search.lang);
 		sclear(&com);
 		if(typekeys(t, "na", &com)){
diff --git a/tests/ibus_test.c b/tests/ibus_test.c
index 77c88ae..a8a6128 100644
--- a/tests/ibus_test.c
+++ b/tests/ibus_test.c
@@ -238,6 +238,7 @@ nexttrace(struct ct *t, Ibusfix *f, int op, Ictx *ctx)
 		return req;
 	CT_EQ_INT(t, op, req.op);
 	CT_EQ_PTR(t, ctx, req.owner);
+	CT_EQ_INT(t, Cclientpreedit, req.cap);
 	CT_EQ_PTR(t, replyc, req.reply);
 	return req;
 }
diff --git a/tests/server_test.c b/tests/server_test.c
index 954a92e..c6a76e1 100644
--- a/tests/server_test.c
+++ b/tests/server_test.c
@@ -149,6 +149,7 @@ nextrequest(struct ct *t, Enginegate *g, int op)
 	memset(&req, 0, sizeof req);
 	chanrecv(g->seen, &req);
 	CT_EQ_INT(t, op, req.op);
+	CT_EQ_INT(t, Cclientpreedit, req.cap);
 	return req;
 }
 
diff --git a/tests/test.h b/tests/test.h
index a50ccd9..04ead8a 100644
--- a/tests/test.h
+++ b/tests/test.h
@@ -36,6 +36,7 @@ void	engine_dictionary_queue_latest_wins(struct ct*);
 void	engine_active_owner_lifecycle(struct ct*);
 void	engine_active_owner_reset(struct ct*);
 void	engine_active_owner_caret(struct ct*);
+void	engine_popup_preedit_capability(struct ct*);
 void	engine_commit_contract(struct ct*);
 void	engine_language_switch_state(struct ct*);
 void	engine_telex_history_bound(struct ct*);
diff --git a/tests/unit_test.c b/tests/unit_test.c
index 0ca7813..4201d0a 100644
--- a/tests/unit_test.c
+++ b/tests/unit_test.c
@@ -90,6 +90,7 @@ static const struct ct_test tests[] = {
 	{ "engine/active-owner-lifecycle", engine_active_owner_lifecycle },
 	{ "engine/active-owner-reset", engine_active_owner_reset },
 	{ "engine/active-owner-caret", engine_active_owner_caret },
+	{ "engine/popup-preedit-capability", engine_popup_preedit_capability },
 	{ "engine/commit-contract", engine_commit_contract },
 	{ "engine/language-switch-state", engine_language_switch_state },
 	{ "engine/telex-history-bound", engine_telex_history_bound },