Data cannot be saved directly to the local disk from the browser. Instead, you must either use CGI to save it to another computer or save it to a second browser window. CGI is not an easy option for most researchers, but spawning a second browser window for data storage is relatively easy.
One way to save data from a browser to a local disk in offline laboratory settings is to print the data to another browser window. Text data in this second window can then be cut and pasted into a word processor, which can then be used to save the data to a local disk. Click here to see how a pop-window is created.
In using such a pop-up window, it is preferable to use the multiple display capabilities of Windows 98, whereby the subject uses a separate monitor from the researcher's console. The pop-up, to which data is written, is moved from the subject's screen to the researcher's screen. Switching to Win98, and purchasing an additional monitor video card just for this feature, is not worth the bother since the superior Linux operating system, with the capability for multiple screens in X-windows, can be had for free.
Alternatively, one could simply hide the pop-up window under the stimulus window being used by the subject. The danger of this, however, is that the subject could gain access to this window - something which is not necessarily a crucial issue.
In the examples here, data are being saved to a second browser window held in the frame to the right of the stimulus window. Saving to a frame was done for demonstration purposes only; in a real experiment, one would prefer to spawn a separate hidden window. Nonetheless, one could simple move the browser window such that the right hand data frame is out of the sight of the subject.