Just to amplify my previous message, using the code I orignally provided

? StringToInteger(LEFT(lcrect, 4), .T.) && Left
? StringToInteger(SUBSTR(lcrect, 9, 4)) && Right

This will give you the left and right edges of the task bar. Note that the left edge may be negative. In reality, these are all signed integers, so it may be a good idea to pass .T. to each call of StringToInteger.