# On flow - multiple access

**URL:** <https://discourse.nodered.org/t/on-flow-multiple-access/5038>\
**Category:** General\
**Created:** [19 November 2018 13:26 UTC](https://discourse.nodered.org/t/on-flow-multiple-access/5038 "2018-11-19T13:26:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jhon.zambrano](https://avatars.discourse-cdn.com/v4/letter/j/ea666f/32.png) [@jhon.zambrano](https://discourse.nodered.org/u/jhon.zambrano)\
**Post date:** [19 November 2018 13:26 UTC](https://discourse.nodered.org/t/on-flow-multiple-access/5038/1 "2018-11-19T13:26:34Z")

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hi, i have a flow as show it, is a retransmision Lora messages schema. This flow no have GUI. i wanna know what happen if other flows access to this at the same time or while the schema is running? has nodered multi thread or queue the access?

 ![imagen](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/9/90cdd55ccc4583cf72ed0b59c1c688e196cbdc78.png)

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**Author:** ![TotallyInformation](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/totallyinformation/32/31_2.png) [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Post date:** [2 December 2018 11:35 UTC](https://discourse.nodered.org/t/on-flow-multiple-access/5038/2 "2018-12-02T11:35:21Z")

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Sorry, not really clear what you mean. Do you mean that more than one source can use the link from the RX\_Gateway or Message to Send links?

If so, that is usually OK even though Node-RED is essentially a single threaded app. The Node.JS loop allows apps to seem like they are multi-threaded even though they are not.

Adding some more debug nodes after the delay nodes will help you see exactly what goes on and in what order.