run a remote application

[izzykatz]

this is an SQL application which is installed on the other PC. I want to use the screen KB and mouse of this pc to run the other app.

[JamesPen]

izzykatz it is possible.
But you need to create a network connection between the 2 computers.
The best option is to use network cards and a hub or router.
But you can also set a parallel or USB network.
Have a look at the following article for more information on the subject:
http://www.windowsnetworking.com/j_helmig/usbmain.htm

[Curio]

SQL server runs as a service and will normally be running all the time that the PC is switched on. When set up right it will serve data on ports 1233/1433 and another machine on the network can access and interact with that data as long as Windows Authentication or SQL Authentication is operating properly.

If you don't have an app to interact with it you can use MS Access and set the SQL database as a data source, it is relatively easy to set up. However you still need a network connection.