Hey!
I would need to send a HTML POST with arguments like “usr” and “name” to a server from VBA (MS Office Access) and then catch the reply. Does anyone of you guys know how to do this?
hmm, do you mean from MS Access you want to post to a server script?
from Access to a program, which is using a internal programming language. No .aspx or .php or whatever - but that other program will know how to catch the arguments passed and how to give a reply.
sorry, no clue there and about the late reply.
I’d suggest SitePoint Forums for more programming help 
To connect to an Access DB from a web application, use something like ColdFusion.
application server, middleware | ColdFusion.
Might want to dig up a ColdFusion hosting company as well. Lots are out there.