Adds to the formula in the Window without causing a complete reevaluation.
ADDWFORM(win, "formula")
win 
 
Optional. Window reference. Defaults to current Window.  
"formula" 
 
A string, any valid formula. A formula can be any command, function, or macro. The following are examples of valid formula types:

W1: gnorm(1000,1)
W2: W1*W1
addwform(W2,"overplot(W1,lred)")
This example adds the overplot and sets the Window's formula to W1*W1;overplot(W1, lred) without reevaluating the formula W1*W1.
This function is useful when editing the formula line would cause an unwanted or lengthy recalculation. ADDWFORM can be abbreviated ADDWF.