cursor wierdness

[Joel M. Miller]

If I'm logged in to my AUX 2.0 account and leave the keyboard and mouse
idle, after 15 min or so the arrow cursor begins to alternate with a
small black square.  What does this mean? 
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Joel M Miller                    Internet: jmm at skivs.ski.org
Smith-Kettlewell Institute       Usenet:   fernwood!skivs!jmm
2232 Webster St                  Bitnet:   jmm%skivs.ski.org at fernwood.mpk.ca.us
San Francisco, CA 94115          Voice:    415/561-1703     Fax: 415/561-1610