This really depends on what you mean by remote access. If you want to see what's running on the external PC you can use remote desktop (a summary of setting this up is below). If you're running LabVIEW and want to see a VI you could try "remote panel connection" in the tools menu.
To use remote desktop the external PC needs to be running WinXP Pro (and the other PC needs a version of WinXP).
To enable remote desktop on the external PC, go to "system properties" (right-click on "my computer" and select "properties"), and enable it on the "remote" tab.
From the other PC, go to start->all programs->accessories->communications->remote desktop connection.
