diff --git a/index.html b/index.html
index feb9576..c725e3c 100644
--- a/index.html
+++ b/index.html
@@ -20,8 +20,8 @@
                 <span class="less ellipsis pure-u-3-4" id="fromLabel"></span>
             </div>
             <div class="inline-flex pure-u-1 pure-u-sm-1-2">
-                <span class="ellipsis pure-u-1-4">Recipient</span>
-                <span class="less ellipsis pure-u-3-4" id="recipientLabel"></span>
+                <span class="ellipsis pure-u-1-4">To</span>
+                <span class="less ellipsis pure-u-3-4" id="toLabel"></span>
             </div>
             <div class="inline-flex pure-u-1 pure-u-sm-1-2">
                 <span class="ellipsis pure-u-1-4">Progress</span>
@@ -233,8 +233,8 @@ async function handlePrimaryButtonClick() {
             $.all('.columns').forEach(e => e.dispatchEvent(new Event('change')));
             break;
         case 'READY':
-            let locale = $('#locale').value;
-            let options = { locale, subcategories, save, mapping: new Object(), start: 2, limit: null };
+            let [start, end] = [null, null];
+            let options = { locale: $('#locale').value, subcategories, save, mapping: new Object() };
 
             for (let element of $.all("input[type='number'].params")) {
                 parameters[element.id] = element.disabled ? null : element.valueAsNumber;
@@ -257,11 +257,11 @@ async function handlePrimaryButtonClick() {
             }
 
             if (options.slice) {
-                options.limit = Math.min(minor || major, $('#chunksize').valueAsNumber);
-                options.start += $('#offset').valueAsNumber * $('#chunksize').valueAsNumber;
+                start = $('#offset').valueAsNumber * $('#chunksize').valueAsNumber;
+                end = Math.min(minor || major, $('#chunksize').valueAsNumber);
             }
 
-            await Rpc2.invoke('begin', { params: [options, parameters] });
+            await Rpc2.invoke('begin', { params: [options, parameters, start, end] });
             break;
         case 'RUNNING':
             await Rpc2.invoke('pause');
@@ -450,7 +450,7 @@ while (await new Promise(o => setTimeout(o, 1000, true))) {
 
             $('#progressLabel').innerText = `${parseFloat(count / total * 100).toFixed(2)}% (${count}/${total})`;
             $('#subjectLabel').innerText = subject ?? '';
-            $('#recipientLabel').innerText = recipient ? `${recipient} <${email}>` : email ?? '';
+            $('#toLabel').innerText = recipient ? `${recipient} <${email}>` : email ?? '';
 
             let uptime = await Rpc2.invoke('uptime').catch(() => 0);
             $('#uptimeLabel').innerText = Temporal.Duration.from({ seconds: uptime }).round({ largestUnit: 'hours' }).toLocaleString('en', { style: 'digital' });
diff --git a/main.py b/main.py
index b3253f2..2b277e5 100644
--- a/main.py
+++ b/main.py
@@ -65,11 +65,13 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
     wb: Workbook = None
     filename: str = None
     column: ColumnMapping = None
-    limit = 0
+    start, end, limit = 2, 0, 0
     
-    def begin(opts: dict, args: dict):
-        nonlocal status
+    def begin(opts: dict, args: dict, i, j):
+        nonlocal status, start, end
         if status != Status.READY: raise ValueError(status)
+        if i: start += i
+        if j: end = j
         options.update(opts)
         status = Status.RUNNING
         parameters.update(args)
@@ -91,7 +93,7 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
         result = dict()
         col = headers.index(header) + 1
         
-        for row in range(options.get('start'), limit + 1):
+        for row in range(start, limit + 1):
             key = str(wb.active.cell(row, col).value)
             result[key] = result.get(key, 0) + 1
         
@@ -315,7 +317,7 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
         source = load_workbook(buffer)
         source.active.cell(1, col).value = column.sent
         
-        for row in range(options.get('start'), limit + 1):
+        for row in range(start, limit + 1):
             c1 = source.active.cell(row, col)
             c2 = wb.active.cell(row, col)
             if not (c1.value and str(c1.value).strip()):
@@ -403,13 +405,13 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
                     logger.warning("[%d/%d] Exhausted all allowed attempts; skipping", index-1, limit-1)
                     raise Skip()
                 
-                if options.get('slice') and (start := options.get('start')) and (end := options.get('limit')):
-                    if index < start or index >= start + end:
-                        logger.info("[%d/%d] Not planned; skipping '%s'", index-1, limit-1, email)
-                        raise Next()
+                if options.get('slice'):
                     if (items := options.get('subcategories')) and (item := str(cell(index, column.region).value)) not in items:
                         logger.info("[%d/%d] Value '%s' not enlisted; skipping '%s'", index-1, limit-1, item, email)
                         raise Next()
+                    if index < start or index >= start + end:
+                        logger.info("[%d/%d] Not planned; skipping '%s'", index-1, limit-1, email)
+                        raise Next()
                 
                 if (sent := cell(index, column.sent).value) is not None and str(sent).strip():
                     logger.info("[%d/%d] Already visited; skipping '%s'", index-1, limit-1, email)