> ## Documentation Index > Fetch the complete documentation index at: https://docs.revoengine.com/llms.txt > Use this file to discover all available pages before exploring further. # Interactive examples > Explore RevoEngine execution boundaries with local, controllable simulations. Use these local simulations to compare what happens at a RevoEngine boundary. Start with a guard rejection, a shared concurrency key, or a receiver that loses its response after applying an effect. The scenarios use synthetic data, and their playback ticks are illustrative. ## Capacity and duplicate protection > [card] [Job concurrency](https://docs.revoengine.com/patterns/job-concurrency.md#explore-the-behavior) > > Change a per-key limit and watch waiting Jobs enter available slots. > [card] [Coordination keys](https://docs.revoengine.com/patterns/coordination-keys.md#explore-the-behavior) > > Compare shared capacity with two independent template keys. > [card] [Idempotency](https://docs.revoengine.com/patterns/idempotency.md#explore-the-behavior) > > Compare a stable business key, a new key per retry and an overly broad key. > [card] [Low-code admission](https://docs.revoengine.com/patterns/low-code-concurrency.md#explore-the-behavior) > > See admission, BUSY and exact release ownership. ## Request and execution flows | Explore | Change the scenario | Observe | | - | - | - | | [Endpoint guard](https://docs.revoengine.com/operate/endpoints.md#explore-the-behavior) | Valid input, invalid input, missing route, denied access, static response | Which boundary stops the request before business execution | | [SSE](https://docs.revoengine.com/operate/endpoint-sse.md#explore-the-behavior) | Success, admission failure, failure after opening | HTTP acceptance versus terminal stream outcome | | [Background work](https://docs.revoengine.com/patterns/acceptance-and-completion.md#explore-the-behavior) | Accepted work or lost response | Receipt, durable identifier and confirmed completion | | [Job retry](https://docs.revoengine.com/operate/jobs.md#explore-the-behavior) | Error, capacity wait, uncertain effect | New attempt versus the same waiting attempt | | [Storage](https://docs.revoengine.com/operate/storage-uploads.md#explore-the-behavior) | Asynchronous indexing or invalid synchronous CSV | Byte transfer, finalization and structured readiness | | [Events](https://docs.revoengine.com/operate/events.md#explore-the-behavior) | Matching filter, non-match, replay | Subscription dispatch and separate target outcome | | [Schedules](https://docs.revoengine.com/operate/schedules.md#explore-the-behavior) | Active or paused | Due time, input resolution and later admission | ## Authoring, state and governance | Explore | What to expect | | - | - | | [Widget refresh](https://docs.revoengine.com/widgets/refresh.md#explore-the-behavior) | Exact requested IDs merge while existing input state remains | | [Transactions](https://docs.revoengine.com/patterns/transactions.md#explore-the-behavior) | Local commit or rollback, with external effects outside the boundary | | [Bounded reads](https://docs.revoengine.com/patterns/bounded-data.md#explore-the-behavior) | A preview differs from a complete cursor scan | | [Hosted revisions](https://docs.revoengine.com/build/custom-nodejs.md#explore-the-behavior) | Saved source becomes eligible only after readiness and activation | | [Action approval](https://docs.revoengine.com/ai/approvals-and-plans.md#explore-the-behavior) | Approve, reject or re-review a stale proposal | | [Authentication](https://docs.revoengine.com/developers/authentication.md#explore-the-behavior) | Identity, target permission and request validation are separate checks | ## Routing and delivery | Explore | What to change | What to observe | | - | - | - | | [Event filtering](https://docs.revoengine.com/operate/event-filters.md#explore-the-behavior) | Message values, numeric type, occurrence metadata, all/any | Exact conditions that admit this subscription | | [Dispatch and Replay](https://docs.revoengine.com/patterns/delivery-guarantees.md#explore-the-behavior) | Redeliver an occurrence or create a Replay | Reused versus new initial child Jobs | | [Outbound Webhooks](https://docs.revoengine.com/operate/webhooks.md#explore-the-behavior) | Receiver deduplication, lost response, retry cap, stop on 401 | HTTP attempts versus receiver business effects | [Metadata and correlation](https://docs.revoengine.com/patterns/metadata-and-correlation.md) explains which values belong in definitions, published Events, messages and outbound requests. ## Data, access and client behavior | Explore | What to expect | | - | - | | [Permission and ACL](https://docs.revoengine.com/operate/permissions.md#explore-the-behavior) | A platform role alone does not admit a restricted resource | | [Vault grants](https://docs.revoengine.com/operate/vault.md#explore-the-behavior) | Connecting an account and granting a consumer are separate steps | | [Realtime reconnect](https://docs.revoengine.com/operate/realtime.md#explore-the-behavior) | Refetch authoritative state after gaps; reject older local projections | | [Application cache](https://docs.revoengine.com/operate/database-cache.md#explore-the-behavior) | Rebuild a miss; atomic insertion does not deduplicate preceding work | | [View source actions](https://docs.revoengine.com/operate/database-views.md#explore-the-behavior) | Review a workset; re-preview after the View or materialization changes | | [SDK batches](https://docs.revoengine.com/developers/sdk-storage-and-batching.md#explore-the-behavior) | Independent results versus stop-on-error, without rollback | | [CLI synchronization](https://docs.revoengine.com/developers/cli-projects.md#explore-the-behavior) | Fast-forward a clean copy or resolve divergent changes | | [Native tests](https://docs.revoengine.com/build/native-tests.md#explore-the-behavior) | Test evidence belongs to captured source and does not activate it | | [Execution evidence](https://docs.revoengine.com/operate/traces.md#explore-the-behavior) | Receipt, terminal execution and durable result; disclose coverage gaps | | [MCP sessions](https://docs.revoengine.com/developers/mcp-sessions.md#explore-the-behavior) | Initialize under the current credential and inspect the tool outcome | Use **Next step** to inspect a boundary. **Play** advances the example at a steady pace. Select an earlier stage in a walkthrough or use the example’s reset controls to revisit a result. With reduced motion, use manual steps. Exact fields, defaults, limits and failure semantics remain in the guide beside each demonstration and in [Reference](https://docs.revoengine.com/low-code/reference/index.md). Historical release notes and legal terms are not simulations. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.