If set, the iMacros Browser will replay the macro in tray mode. The browser window will not be seen, only an icon in the Windows System Tray will indicate that iMacros is running. It can be used also with iMacros.Sidebar.exe. In this case, the iMacros sidebar is not seen, but IE is still visible.
No value required.
imacros.exe -macro test1 -tray
imacros.sidebar.exe -macro Demo\FillForm -tray