here is my favorite keyboard macro-tool (HID macros - free).
It allows you to connect several USB keyboards/numeric-pads to the Pc.
Almost all single keys can be allocated to execute many key sequences and macros.
I have used it now for two weeks (day-trading) and it has reduced all the hectic
in repeating operation to a single key press. It also helped to reduce the amount
of monitors i needed.
Shares Your Mouse, Keyboard, and Files Between Multiple Windows Computers
Windows: If you use multiple computers at the same desk, it's annoying to use multiple sets of mice and keyboards. Free app Mouse Without Borders lets you share your mouse and keyboard with other machines, and even drag and drop files between them.