I want to know the Maximum number of orders I can open in my account at a time.
Octafx replied me there is no limitation, I need to verify it.
Maximum allowed number of active pending orders
Your orders are limited by your deposit funds and the margin and carried losses .... Usually people stay well below their margin limits so that they do not have forced exits by the brokers due to margin calls. Your MT4 always tells you how much available margin you have. When it gets near zero your Broker will start closing your positions without any notice. it is called a margin call.