General :: Communicating Between Different Access Databases

I have an access db as the backend with the tables. Then multiple front end access dbs that link to the tables (as external sources). The front end dbs are setup with different forms on a per user basis, depending on their role. From my user db I want to be able to request information from another user. I want something in their db to pop-up and request the information.

I was thinking about approaching it using the datamacros. I thought maybe each front end db could have a messages table that the main db and other front ends link to. Then whenever they add data to your specific table it would respond and ask the user for the information. The info would then populate back into the message table where it could be retrieved by the requester.

Example: User A opens A.accdb and has a table called A_tbl. User B opens B.accdb and has a link to A.accdb.A_tbl. User B adds a record to A.accdb.A_tbl with Field1 = "what is your name". User A receives a pop-up with the info from Field1 and responds in a textbox for Field2. User B can then look at A.accdb.A_tbl and see the response as Field2.

Another option I thought of was simply trying to get one db to run a form/macro on another db remotely.

Example: User A opens A.accdb and User B opens B.accdb. User A clicks a button on one of his forms and it opens B.accdb.FORM in the session of User B. User B fills out the form and submits. User A retrieves data from shared tables as normal.