> For the complete documentation index, see [llms.txt](https://docs.overthereality.ai/over-sdk-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.overthereality.ai/over-sdk-manual/over-visual-scripting-legacy/nodes/flow.md).

# Flow

In order to start the execution of nodes within the [OverGraph](/over-sdk-manual/over-visual-scripting-legacy/visual-scripting-essentials/overgraph.md), it is necessary to insert event nodes. These represent the start of a flow, so at least one of these nodes must be present in the [OverGraph](/over-sdk-manual/over-visual-scripting-legacy/visual-scripting-essentials/overgraph.md), or no execution of the nodes will occur.