To allow the Client Software Window to be moved around on the Desktop in Windowed Mode
You can edit the setup.ini file located in the Client Sofware Program Files Folder on your drive 
First CLOSE the Client Software
Locate the target folder where you installed the Client Software
Default installation puts it in the following folder
C:\Program Files\Core 4\Client  or  (ProgramFilesx86 \Core 4\Client )
Browse to and lcoate the setup.ini file
Right click and and Open With Notepad 
Find this line about 6 sections down and change the value to =1 
;set to 1 to enable the client to run in windowed mode, allowing you to move the UI around. default is 0.
WindowedMode=1 
Save and Close
Reopen the Client Software