Can I Save a Waveform to the Scope's Memory on the 546xx?

No, it is not possible to save data to the scope's memory. When the Digitize command executes, it flushes the data, arms the trigger, and acquires the specified channel(s). The waveforms stored in memory save only the image, not the data. An array stores each pixel value on the display as being either on or off. By contrast, the data captured with Digitize can store many times more data points than the number of display pixels on the screen. An example of the difference between saving the data and saving the image, is that you could use infinite persistence and recall a screen image which has multiple values on the screen.