Network Designer commands:
- keyboard commands are: 
Key  Object to insert
H    hub
S    Switch
R    Router
P    PC
M    Modem
N    Printer
V    Server
I    Internet
L    Link
T    text (label)
C    Clear
Z    capture image and save it to bitmap file.

NOTES: 
- to link two objects with the Link (L) press 'L' then tap at the starting point and then tap the destination point.
- When 'Z' is pressed to save the image as a bitmap, it'll be saved to the default directory of
 "\my documents\images\netdesign.bmp".
- When 'T' is pressed to enter a Label,  the program will wait for a pen touch to identify where to enter the Label, then a message box will pop up asking for the label text.