Once you have generated deployment keys at http://www.keyoti.com/KeyMaker/main.aspx you should set the LicenseKey property of RapidSpellWeb or RapidSpellWInlineHelper Control, or in your web.config (see below). If the deployment keys are not correct then attempts to use the control on a remote server will result in alert messages.
Eg. LicenseKey property
<RapidSpellWeb:RapidSpellWeb id="rapidSpellWeb" runat="server" LicenseKey="1234567890123456789012345678901234567890"/>
Eg. web.config;
<appSettings><add key="Keyoti-RapidSpellWeb-LicenseKey" value="..."/></appSettings>
If you have more than one domain/servername (and therefore deployment key) for the app. you can easily specify a second key by adding a key called "Keyoti-RapidSpellWeb-LicenseKey2".
If you are using a multi-server development environment (eg. dev-server -> test-server -> productionserver) please see the 'Advanced' section for license key handling strategy.