diff --git a/src/elements.tsx b/src/elements.tsx
index 5f5e21af..a111a19d 100644
--- a/src/elements.tsx
+++ b/src/elements.tsx
@@ -6,6 +6,10 @@ import {boundMethod} from "autobind-decorator";
 import cn from "classnames";
 import {If, For, When, Otherwise, Choose} from "tsx-control-statements/components";
 
+function renderCmdText(text : string) : any {
+    return <span>&#x2318;{text}</span>;
+}
+
 class CmdStrCode extends React.Component<{cmdstr : string, onUse : () => void, onCopy : () => void, isCopied : boolean, fontSize : "normal" | "large", limitHeight : boolean}, {}> {
     @boundMethod
     handleUse(e : any) {
@@ -65,4 +69,4 @@ class Toggle extends React.Component<{checked : boolean, onChange : (value : boo
     }
 }
 
-export {CmdStrCode, Toggle};
+export {CmdStrCode, Toggle, renderCmdText};
diff --git a/src/linecomps.tsx b/src/linecomps.tsx
index c45fa294..4245bc14 100644
--- a/src/linecomps.tsx
+++ b/src/linecomps.tsx
@@ -12,6 +12,7 @@ import type {LineType, CmdDataType, FeStateType, RemoteType, RemotePtrType, Rend
 import cn from "classnames";
 import {TermWrap} from "./term";
 import type {LineContainerModel} from "./model";
+import {renderCmdText} from "./elements";
 
 dayjs.extend(localizedFormat)
 
@@ -125,7 +126,7 @@ class LineAvatar extends React.Component<{line : LineType, cmd : Cmd}, {}> {
 
 
 @mobxReact.observer
-class LineCmd extends React.Component<{screen : LineContainerModel, line : LineType, width : number, staticRender : boolean, visible : OV<boolean>, onHeightChange : HeightChangeCallbackType, topBorder : boolean, renderMode : RenderModeType, overrideCollapsed : OV<boolean>, noSelect? : boolean}, {}> {
+class LineCmd extends React.Component<{screen : LineContainerModel, line : LineType, width : number, staticRender : boolean, visible : OV<boolean>, onHeightChange : HeightChangeCallbackType, topBorder : boolean, renderMode : RenderModeType, overrideCollapsed : OV<boolean>, noSelect? : boolean, showHints? : boolean}, {}> {
     lineRef : React.RefObject<any> = React.createRef();
     cmdTextRef : React.RefObject<any> = React.createRef();
     rtnStateDiff : mobx.IObservableValue<string> = mobx.observable.box(null, {name: "linecmd-rtn-state-diff"});
@@ -514,6 +515,11 @@ class LineCmd extends React.Component<{screen : LineContainerModel, line : LineT
                         </If>
                     </div>
                 </If>
+                <If condition={isSelected && !isFocused}>
+                    <div className="cmd-hints">
+                        <div className="hint-item color-nohover-white">focus line ({renderCmdText("L")})</div>
+                    </div>
+                </If>
             </div>
         );
     }
diff --git a/src/main.tsx b/src/main.tsx
index 6c82e0ce..80c7d886 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -19,6 +19,7 @@ import {BookmarksView} from "./bookmarks";
 import {HistoryView} from "./history";
 import {Line, Prompt} from "./linecomps";
 import {ScreenSettingsModal, SessionSettingsModal} from "./settings";
+import {renderCmdText} from "./elements";
 
 dayjs.extend(localizedFormat)
 
@@ -41,10 +42,6 @@ type InterObsValue = {
     timeoutid? : any,
 };
 
-function renderCmdText(text : string) : any {
-    return <span>&#x2318;{text}</span>;
-}
-
 function isBlank(s : string) : boolean {
     return (s == null || s == "");
 }
@@ -1444,8 +1441,12 @@ class CmdInput extends React.Component<{}, {}> {
     }
 
     @boundMethod
-    clickHistoryHint() : void {
+    clickHistoryHint(e : any) : void {
+        e.preventDefault();
+        e.stopPropagation();
+        
         let inputModel = GlobalModel.inputModel;
+        console.log("hitory hint", inputModel.historyShow.get());
         if (inputModel.historyShow.get()) {
             inputModel.resetHistory();
         }
@@ -1514,7 +1515,7 @@ class CmdInput extends React.Component<{}, {}> {
                     </div>
                     <div className="cmd-hints">
                         <If condition={!focusVal}><div onClick={this.clickFocusInputHint} className="hint-item color-white">focus input ({renderCmdText("I")})</div></If>
-                        <If condition={focusVal}><div onClick={this.clickHistoryHint} className="hint-item color-green"><i className={cn("fa-sharp fa-solid", (historyShow ? "fa-angle-down" : "fa-angle-up"))}/> {historyShow ? "close history (esc)" : "show history (ctrl-r)"}</div></If>
+                        <If condition={focusVal}><div onMouseDown={this.clickHistoryHint} className="hint-item color-green"><i className={cn("fa-sharp fa-solid", (historyShow ? "fa-angle-down" : "fa-angle-up"))}/> {historyShow ? "close history (esc)" : "show history (ctrl-r)"}</div></If>
                     </div>
                 </div>
             </div>
@@ -2173,6 +2174,17 @@ class ScreenTabs extends React.Component<{session : Session}, {}> {
                 showingScreens.push(screen);
             }
         }
+        showingScreens.sort((a, b) => {
+            let aidx = a.screenIdx.get();
+            let bidx = b.screenIdx.get();
+            if (aidx < bidx) {
+                return -1;
+            }
+            if (aidx > bidx) {
+                return 1;
+            }
+            return 0;
+        });
         return (
             <div className="screen-tabs-container">
                 <div className={cn("screen-tabs", {"scrolling": this.scrolling.get()})} ref={this.tabsRef} onScroll={this.handleScroll}>
diff --git a/src/model.ts b/src/model.ts
index 7b762842..a8d69a16 100644
--- a/src/model.ts
+++ b/src/model.ts
@@ -2,7 +2,7 @@ import * as mobx from "mobx";
 import {sprintf} from "sprintf-js";
 import {boundMethod} from "autobind-decorator";
 import {debounce} from "throttle-debounce";
-import {handleJsonFetchResponse, base64ToArray, genMergeData, genMergeSimpleData, boundInt, isModKeyPress} from "./util";
+import {handleJsonFetchResponse, base64ToArray, genMergeData, genMergeDataMap, genMergeSimpleData, boundInt, isModKeyPress} from "./util";
 import {TermWrap} from "./term";
 import {v4 as uuidv4} from "uuid";
 import type {SessionDataType, LineType, RemoteType, HistoryItem, RemoteInstanceType, RemotePtrType, CmdDataType, FeCmdPacketType, TermOptsType, RemoteStateType, ScreenDataType, ScreenOptsType, PtyDataUpdateType, ModelUpdateType, UpdateMessage, InfoType, CmdLineUpdateType, UIContextType, HistoryInfoType, HistoryQueryOpts, FeInputPacketType, TermWinSize, RemoteInputPacketType, FeStateType, ContextMenuOpts, RendererContext, RendererModel, PtyDataType, BookmarkType, ClientDataType, HistoryViewDataType, AlertMessageType, HistorySearchParams, FocusTypeStrs, ScreenLinesType, HistoryTypeStrs} from "./types";
@@ -2228,7 +2228,7 @@ class Model {
     activeSessionId : OV<string> = mobx.observable.box(null, {name: "activeSessionId"});
     sessionListLoaded : OV<boolean> = mobx.observable.box(false, {name: "sessionListLoaded"});
     sessionList : OArr<Session> = mobx.observable.array([], {name: "SessionList", deep: false});
-    screenList : OArr<Screen> = mobx.observable.array([], {name: "ScreenList", deep: false});
+    screenMap : OMap<string, Screen> = mobx.observable.map({}, {name: "ScreenMap", deep: false});
     ws : WSControl;
     remotes : OArr<RemoteType> = mobx.observable.array([], {name: "remotes", deep: false});
     remotesLoaded : OV<boolean> = mobx.observable.box(false, {name: "remotesLoaded"});
@@ -2580,14 +2580,11 @@ class Model {
         let update : ModelUpdateType = genUpdate;
         if ("screens" in update) {
             if (update.connect) {
-                this.screenList.clear();
+                this.screenMap.clear();
             }
-            genMergeData(this.screenList, update.screens, (s : Screen) => s.screenId, (sdata : ScreenDataType) => sdata.screenid, (sdata : ScreenDataType) => new Screen(sdata), null);
-            for (let i=0; i<update.screens.length; i++) {
-                let screen = update.screens[i];
-                if (screen.remove) {
-                    this.removeScreenLinesByScreenId(screen.screenid);
-                }
+            let mods = genMergeDataMap(this.screenMap, update.screens, (s : Screen) => s.screenId, (sdata : ScreenDataType) => sdata.screenid, (sdata : ScreenDataType) => new Screen(sdata));
+            for (let i=0; i<mods.removed.length; i++) {
+                this.removeScreenLinesByScreenId(mods.removed[i]);
             }
         }
         if ("sessions" in update) {
@@ -2689,8 +2686,7 @@ class Model {
 
     getScreenNames() : Record<string, string> {
         let rtn : Record<string, string> = {};
-        for (let i=0; i<this.screenList.length; i++) {
-            let screen = this.screenList[i];
+        for (let screen of this.screenMap.values()) {
             rtn[screen.screenId] = screen.name.get();
         }
         return rtn;
@@ -2752,19 +2748,12 @@ class Model {
     }
 
     getScreenById(sessionId : string, screenId : string) : Screen {
-        for (let i=0; i<this.screenList.length; i++) {
-            let screen = this.screenList[i];
-            if (screen.screenId == screenId) {
-                return screen;
-            }
-        }
-        return null;
+        return this.screenMap.get(screenId);
     }
 
     getSessionScreens(sessionId : string) : Screen[] {
         let rtn : Screen[] = [];
-        for (let i=0; i<this.screenList.length; i++) {
-            let screen = this.screenList[i];
+        for (let screen of this.screenMap.values()) {
             if (screen.sessionId == sessionId) {
                 rtn.push(screen);
             }
diff --git a/src/sh2.less b/src/sh2.less
index 53a24122..0903520a 100644
--- a/src/sh2.less
+++ b/src/sh2.less
@@ -1671,6 +1671,21 @@ body::-webkit-scrollbar {
             padding-bottom: 5px;
         }
     }
+
+    .cmd-hints {
+        position: absolute;
+        bottom: 0px;
+        right: 0px;
+        display: none;
+
+        .hint-item {
+            border-radius: 3px;
+        }
+    }
+
+    &:hover .cmd-hints {
+        display: flex;
+    }
 }
 
 body .xterm .xterm-viewport {
@@ -2782,6 +2797,12 @@ input[type=checkbox] {
             color: white;
         }
     }
+
+    .hint-item.color-nohover-green {
+        color: black;
+        background-color: @tab-green;
+        cursor: default;
+    }
     
     .hint-item.color-white {
         color: black;
@@ -2791,6 +2812,27 @@ input[type=checkbox] {
             background-color: @term-bright-white;
         }
     }
+
+    .hint-item.color-nohover-white {
+        color: black;
+        background-color: @term-white;
+        cursor: default;
+    }
+
+    .hint-item.color-blue {
+        color: black;
+        background-color: @tab-blue;
+        
+        &:hover {
+            color: white;
+        }
+    }
+
+    .hint-item.color-nohover-blue {
+        color: black;
+        background-color: @tab-blue;
+        cursor: default;
+    }
 }
 
 .settings-field {
diff --git a/src/util.ts b/src/util.ts
index 798169fb..4c1f8818 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -142,6 +142,45 @@ function genMergeData<ObjType extends IObjType<DataType>, DataType extends IData
     objs.replace(newObjs);
 }
 
+function genMergeDataMap<ObjType extends IObjType<DataType>, DataType extends IDataType>(
+    objMap : mobx.ObservableMap<string, ObjType>,
+    dataArr : DataType[],
+    objIdFn : (obj : ObjType) => string,
+    dataIdFn : (data : DataType) => string,
+    ctorFn : (data : DataType) => ObjType,
+) : {added : string[], removed : string[]}
+{
+    let rtn : {added : string[], removed : string[]} = {added: [], removed: []};
+    if (dataArr == null || dataArr.length == 0) {
+        return rtn;
+    }
+    for (let i=0; i<dataArr.length; i++) {
+        let dataItem = dataArr[i];
+        let id = dataIdFn(dataItem);
+        let obj = objMap.get(id);
+        if (dataItem.remove) {
+            if (obj != null) {
+                obj.dispose();
+                objMap.delete(id);
+                rtn.removed.push(id);
+            }
+            continue;
+        }
+        if (obj == null) {
+            if (!dataItem.full) {
+                console.log("cannot create object, dataitem is not full", dataItem);
+                continue
+            }
+            obj = ctorFn(dataItem);
+            objMap.set(id, obj);
+            rtn.added.push(id);
+            continue;
+        }
+        obj.mergeData(dataItem);
+    }
+    return rtn;
+}
+
 function parseEnv0(envStr64 : string) : Map<string, string> {
     let envStr = atob(envStr64);
     let parts = envStr.split("\x00");
@@ -182,4 +221,4 @@ function incObs(inum : mobx.IObservableValue<number>) {
     })();
 }
 
-export {handleJsonFetchResponse, base64ToArray, genMergeData, genMergeSimpleData, parseEnv0, boundInt, isModKeyPress, incObs};
+export {handleJsonFetchResponse, base64ToArray, genMergeData, genMergeDataMap, genMergeSimpleData, parseEnv0, boundInt, isModKeyPress, incObs};