a code question..??

hi.. i have a situation where i have a client app (A), and another app (B). i'd like to be able to have app A have a login dialog. I'd like the login dialog to be comming/run from app B. so i envision somehow having code from app B within app A, that essentially is bing run +------------------+ | login | | function <<<-----+ from app B | | | | | | | | | | app A | | | | | |------------------+ | | ^ | +------------------+ | | login | | | function >>>>>>--+ | code (php) | | | | | | app B | | | |------------------+ my question is how the heck can i do this... i want the code to run on app B if possible. but the display of the code segment, will be a dialog for user input. so, once the user inputs information in the app A dialog, i need to be able to run the results on app B (which is where the code would reside) and then return the resulting information back to app A... is this even possible?? is there an easier solution...??? thanks -bruce bedouglas@earthlink.net