Remote Desktop pauses execution when unfocused

I've a virtual machine which I'm accessing via Remote Desktop Connection (RDC). I'm running an EXE which is firing a number of windows within a loop and closes them down after. All works fine while I'm physically looking after the process. Once an RDC window stops to be the topmost one (say I swithc to MS Outlook) - the whole process gets paused until my RDC window gets 'focused' again. I wonder how do I keep things worki开发者_高级运维ng independetnly of RDC window focus state?

Thanks.