Think it is time to draw a line under this thread.
I for one am going to drop out (again). OP can't clearly explain what they actually want to do but appears to want to build a tool for vaguely defined purpose even if those tools exist elsewhere. A number of links or suggestions have been provided.
In summary
'native access' (in fact any office app) can't do what is required without the use of an external library outside of those that come as 'standard'. The OP has suggested the libraries Mswinsck.ocx and mscomm.ocx but has not provided any evidence these can do whatever it is required or pointed to anything that shows how to successfully install and use them.
Use of Powershell has been suggested - but doesn't meet the requirement that it must be in Access
No-one has any idea whether PocketBase can send notifications in a way that the above two libraries can detect. And since it appears only the OP is interested in this - suggest the OP needs to try a different forum.
"..OP can't clearly explain what they actually want to do..."
Whhaaatttts ???
I have explained and re-explained several times what I would like to achieve, see posts 1, 15, 19, 38, 42, 45, 64, 66
"...The OP has suggested the libraries Mswinsck.ocx and mscomm.ocx but has not provided..."
Perhaps you missed post 64, there is a splendid example of how to make the vba code able to 'wait' for external communications
"..Use of Powershell has been suggested - but doesn't meet the requirement that it must be in Access.."
No no, that's not the point, using PowerShell is perfectly acceptable if it could be interfaced with PocketBase
"...And since it appears only the OP is interested in this..."
Allow me to have very great doubts about this, the subject is of explosive utility in many applications, even in simple accounting applications, and being able to implement what is required would allow for a procedure created with Access to be perfectly responsive to external stimuli even without the use of periodic polling
"...suggest the OP needs to try a different forum..."
Yes, thanks for the advice, I've already tried different forums
But if you don't mind, I'll continue to use this too
Someone warn KitaYama that we are at 100