diff --git a/differences.md b/differences.md
index 1a921ba..fc3cad3 100644
--- a/differences.md
+++ b/differences.md
@@ -11,7 +11,7 @@
 | Feature | Go | .NET | Notes |
 |---------|:--:|:----:|-------|
 | NKey generation (server identity) | Y | Y | Ed25519 key pair via NATS.NKeys at startup |
-| System account setup | Y | Y | `$SYS` account created; no event publishing yet (stub) |
+| System account setup | Y | Y | `$SYS` account with InternalEventSystem, event publishing, request-reply services |
 | Config file validation on startup | Y | Y | Full config parsing with error collection via `ConfigProcessor` |
 | PID file writing | Y | Y | Written on startup, deleted on shutdown |
 | Profiling HTTP endpoint (`/debug/pprof`) | Y | Stub | `ProfPort` option exists but endpoint not implemented |
@@ -64,9 +64,9 @@
 | ROUTER | Y | N | Excluded per scope |
 | GATEWAY | Y | N | Excluded per scope |
 | LEAF | Y | N | Excluded per scope |
-| SYSTEM (internal) | Y | N | |
+| SYSTEM (internal) | Y | Y | InternalClient + InternalEventSystem with Channel-based send/receive loops |
 | JETSTREAM (internal) | Y | N | |
-| ACCOUNT (internal) | Y | N | |
+| ACCOUNT (internal) | Y | Y | Lazy per-account InternalClient with import/export subscription support |
 | WebSocket clients | Y | N | |
 | MQTT clients | Y | N | |
 
@@ -218,7 +218,7 @@ Go implements a sophisticated slow consumer detection system:
 |---------|:--:|:----:|-------|
 | Per-account SubList isolation | Y | Y | |
 | Multi-account user resolution | Y | Y | `AccountConfig` per account in `NatsOptions.Accounts`; `GetOrCreateAccount` wires limits |
-| Account exports/imports | Y | N | |
+| Account exports/imports | Y | Y | ServiceImport/StreamImport with ExportAuth, subject transforms, response routing |
 | Per-account connection limits | Y | Y | `Account.AddClient()` returns false when `MaxConnections` exceeded |
 | Per-account subscription limits | Y | Y | `Account.IncrementSubscriptions()` enforced in `ProcessSub()` |
 | Account JetStream limits | Y | N | Excluded per scope |
@@ -406,6 +406,11 @@ The following items from the original gap list have been implemented:
 - **User revocation** — per-account tracking with wildcard (`*`) revocation
 - **Config file parsing** — custom lexer/parser ported from Go; supports includes, variables, nested blocks, size suffixes
 - **Hot reload (SIGHUP)** — re-parses config, diffs changes, validates reloadable set, applies with CLI precedence
+- **SYSTEM client type** — InternalClient with InternalEventSystem, Channel-based send/receive loops, event publishing
+- **ACCOUNT client type** — lazy per-account InternalClient with import/export subscription support
+- **System event publishing** — connect/disconnect advisories, server stats, shutdown/lame-duck events, auth errors
+- **System request-reply services** — $SYS.REQ.SERVER.*.VARZ/CONNZ/SUBSZ/HEALTHZ/IDZ/STATSZ with ping wildcards
+- **Account exports/imports** — service and stream imports with ExportAuth, subject transforms, response routing, latency tracking
 
 ### Remaining Lower Priority
 1. **Dynamic buffer sizing** — delegated to Pipe, less optimized for long-lived connections