A common pattern in SaaS apps is to give each customer a unique subdomain. By default second-level domains are considered internal to your application. (For more info see Defining Internal URLs below)
Say you have your customers login at https://login.yourapp.com which then redirects them to https://yourcustomer.yourapp.com. You can store the last used subdomain and redirect your users there when they open the app.
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// On login to subdomain https://yourcustomer.yourapp.com
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if(windows.todesktop){
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localStorage.setItem('subdomain','yourcustomer');
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}
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// When not already on subdomain then redirect to last used subdomain
We recommend having a separate javascript app for all of your ToDesktop specific login and importing that conditionally when your app is running as a desktop app.